Interesting facts about Earth

    Jedilachlan
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    Post by Jedilachlan on Fri May 29, 2009 3:27 pm

    Hello Viewers,

    I have been reseaching info about our planet 'Earth', below are the facts like telling you the age, size and etc:

    Age: 4.6 billion years old.

    Location: 3rd planet from the sun.

    Size: 5th largest planet in our solar system.

    Surface Area: 197 million square miles, about 70 percent of the Earth's surface is covered with water..

    Diameter: The Earth has an average diameter of 12,742 kilometers. (7,926 miles)

    Average Temperature: The temperature at the Earth's core is estimated to be between 5000 and 7000 degrees Celsius.

    Length of Year: 365.25 days

    Inclination of Axis: The Earth's axis has a tilt of about 23 ½ degrees. It is this tilt which causes the seasons.

    Chemical Composition: The Earth is made mostly of iron, oxygen, silicon, magnesium, nickel and sulfur. Iron, 29.5% Oxygen, 15.2% Silicon, 12.7% Magnesium, 2.4% Nickel, 1.9% Sulfur, 0.05% Titanium

    Below Is A Picture Of Earth From Space:
    Interesting facts about Earth - Page 2 Earth10

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    Post by Puffles on Fri May 29, 2009 5:53 pm

    Next time I am bored, I will think of how boring it would be watching the rock grow! As far as the Angel waterfall, wouldn't it be really awesome to go over the top of it in a raft? Of course, there would need to be a large pool of water at the end! Shocked Laughing
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    Post by Rocka on Fri May 29, 2009 7:41 pm

    another one is thatsome earth animals like the crocidile cant have sharp turns.
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    Post by Rocka on Fri May 29, 2009 8:05 pm

    in many eons the sun will expand and swallow mercury then later venus.

    earth is personified as a goddess.

    the moon is just a giant sattileite.

    earths magnetic feild is only half a gauss.

    it is more than 4.54 billion years old.

    diameter is 12,756.28 km.

    earth is the only planet with plate techtonics.

    earth is the only planet with life.

    Earth is the only planet in the Solar System to have water in all its three states of matter: solid (ice), liquid (sea, rain, etc.) and gas (clouds).

    Earth is almost five billion years old, although life has only existed on the planet for the last 150 to 200 million years. This means that life has been present on the planet for only 5%-10% of its lifetime.

    Earth and Mercury are the two densest planets in the Solar System.
    The length of time it takes for Earth to orbit the Sun is 365 and a quarter days. To make up this extra quarter, which isn't counted at the end of a year, we have an extra day every four years i.e. on 29th February.

    Earth is gradually slowing down. Every few years, an extra second is added to make up for lost time. Millions of years ago, a day on Earth will have been 20 hours long. It is believed that, after a few million years, a day on Earth will be 27 hours long.

    The centre of the Earth i.e. its core is molten. This means that it is liquid rock, which sometimes erupts onto the surface through volcanic eruptions. This core is 7,500° C hotter than the surface of Sun!

    Earth is the only planet in the Solar System not to be named after a mythical God.

    Despite being called Earth, only 29% of the surface is actually 'earth' (land). The rest of the planet's surface (71%) is made up of water.

    From a distance in space, Earth would seem to be the brightest of the 8 planets. This is because large amount of sunlight is reflected by the water on the planet.

    Earth is the only planet in the Solar System known to be geologically active, with earthquakes and volcanoes forming the landscape, replenishing carbon dioxide into the atmosphere and erasing impact craters from meteors.

    Earth's average distance from the Sun is 149,600,000 km (92,960,000 miles)

    Earth has a diameter of 12,760 km and mass of about 5.972 x 1024 kg

    Earth is the fifth largest planet in the Solar System.

    Earth has only one satellite, the Moon. Moon is the second brightest object in the sky, as seen from the planet.

    Earth's atmosphere is composed mainly of nitrogen (77%), oxygen (21%), argon (0.93%), and carbon dioxide (0.03%).

    El Azizia (Libya) is the hottest place on Earth, while Vostok (Antarctica) is the coldest.

    Earth travels at an orbital speed of around 108,000 km (67,000 miles) an hour.

    Earth, along with Mercury, is densest planet in the Solar System.

    Earth is home to millions of species, including humans.

    The average distance between Earth and Moon is 238,857 miles (384,403.1 km).

    i hope i get a v flag btw this was all hand typed.
    took an hour.
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    Post by hugs200 on Fri May 29, 2009 8:12 pm

    DID YOU KNOW THAT THE GREAT WALL OF CHINA IS THE ONLY MANMADE OBJECT VISABLE FROM SPACE (IT HAS BEEN SEEN) by the way this is my first time posting on forum so i will try to get an image on saturday sorry
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    Post by FallenStar on Sat May 30, 2009 2:29 pm

    Did you know that


    The poles on the Earth have changed places - many times! We can tell this has happened because the magnetic moment of the rocks that make up the ocean floor have an alternating direction. Which direction they exhibit depends on which way the poles were oriented when the rocks were being formed at the mid-ocean ridge. During a reversal, which can take thousands of years, the magnetic poles start to wander away from the region around the spin poles, and eventually end up switched around!


    Cool huh! I didnt knew about it until i did the research!

    And my username on Chobots is:FallenStar
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    Post by floppyjacky on Sun May 31, 2009 1:40 am

    natural disaster is the consequence or effect of a natural, hazardous event, occurring when human activities and natural phenomenon (a physical event, such as a volcanic eruption, earthquake, hurricane, tsunami, landslide, etc.) become enmeshed. Natural disasters result in catastrophic consequences for living things in the vicinity. This understanding is crystallized in the formulation: "disasters occur when hazards meet vulnerability." (Blaikie, 1994)
    Source: en.wikipedia.org/wiki/Natural_Disasters

    The Science of Natural Disasters

    For more than 100 years, scientists at Scripps Institution of Oceanography have explored, examined, and studied the natural world in an attempt to understand the complicated mechanisms of the earth. Natural disasters take an alarming toll on the inhabitants of the planet in areas hit hardest by physical events that result in violent and devastating impacts. Researchers at Scripps and elsewhere in the world dig deep and spend years and decades searching for clues to unravel the mysteries of the earth's natural, and often destructive, phenomena.
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    Post by floppyjacky on Sun May 31, 2009 1:42 am

    Hurricanes

    When a severe tropical storm reaches winds of 74 mph (64 knots) or greater, it is classified as a hurricane. In meteorology, a tropical cyclone (or tropical storm, typhoon or hurricane, depending on strength and location) is a type of low-pressure system that generally forms in the tropics. While some, particularly those that make landfall in populated areas, are regarded as highly destructive, tropical cyclones are an important part of the atmospheric circulation system, which moves heat from the equatorial region toward the higher latitudes.

    Recent Hurricane Activity

    Throughout 2004, several major storms struck into Florida and the east coast of the U.S. by the end of the summer, bearing out meteorological forecasts for an active 2004 Atlantic hurricane season.

    Animation of 2004 hurricane season

    On Monday, August 29, 2005, Hurricane Katrina ripped apart thousands of lives and left thousands homeless in the southeast U.S. impacting most heavily in Louisiana (especially Greater New Orleans), Mississippi, and Alabama. This was the most destructive tropical cyclone to hit the United States in historic times.
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    Post by ashley_cool_girl on Sun May 31, 2009 1:55 am

    Interesting Facts About Earth

    There are many things about Earth that most people do not know. It is actually a very interesting planet. A lot of people think that the Earth is round, but it is really pear-shaped. The top is pushed in and the bottom bulges out! The circumference, or distance around the Earth at the equator (or the fattest part of the "pear"), is 24,901.55 miles.

    The Earth is always moving. It spins or rotates while traveling in a big circle around the Sun. Its orbit or path around the Sun is 583,400,000 miles long. Earth travels along this path at 66,000 mile-per-hour. The Earth rotates at 1,000 miles-per-hour. That is pretty fast!

    Here are some other strange facts about Earth. There is a lot of water in the Earth's atmosphere. In fact, there is enough water to cover the entire surface of the Earth with one inch of water! The atmosphere that holds all that water rises 250 miles above the Earth's surface. Our planet is located in the perfect place for our need for water. If it was any closer or farther away from the Sun, all that water would either boil away or freeze.

    Earth's moon is also unique. It is one of the biggest in our solar system. When you look at the moon, you always see the same side. Many people think that Earth has a second moon. This is really Asteroid 3753, but strangely enough, it orbits the Earth.


    Interesting facts about Earth - Page 2 Solar_system
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    Earth is the third planet from the sun. It is named after Terra, the Roman God of Land. Earth's surface has all kinds of things on it. It is mostly made up of water, mountains, hills, and deserts.



    Facts about Earth Distance from the sun 92,897,000 miles
    Diameter 7926.42 miles
    Average surface temperature 57 degrees fahrenheit
    Length of a day 24 hours
    Length of a year 365 1/4 days
    Tilt of axis 23.5 degrees
    Number of natural satellites 1
    Rings No

    Interesting facts about Earth - Page 2 EarthBlueMarbleWestTerra

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    Post by floppyjacky on Sun May 31, 2009 5:21 am

    The tropical rain forest is a forest of tall trees in a region of year-round warmth. An average of 50 to 260 inches (125 to 660 cm.) of rain falls yearly.

    Rain forests belong to the tropical wet climate group. The temperature in a rain forest rarely gets higher than 93 °F (34 °C) or drops below 68 °F (20 °C); average humidity is between 77 and 88%; rainfall is often more than 100 inches a year. There is usually a brief season of less rain. In monsoonal areas, there is a real dry season. Almost all rain forests lie near the equator.

    Rainforests now cover less than 6% of Earth's land surface. Scientists estimate that more than half of all the world's plant and animal species live in tropical rain forests. Tropical rainforests produce 40% of Earth's oxygen.

    A tropical rain forest has more kinds of trees than any other area in the world. Scientists have counted about 100 to 300 species in one 2 1/2-acre (1-hectare) area in South America. Seventy percent of the plants in the rainforest are trees.

    About 1/4 of all the medicines we use come from rainforest plants. Curare comes from a tropical vine, and is used as an anesthetic and to relax muscles during surgery. Quinine, from the cinchona tree, is used to treat malaria. A person with lymphocytic leukemia has a 99% chance that the disease will go into remission because of the rosy periwinkle. More than 1,400 varieties of tropical plants are thought to be potential cures for cancer.

    All tropical rain forests resemble one another in some ways. Many of the trees have straight trunks that don't branch out for 100 feet or more. There is no sense in growing branches below the canopy where there is little light. The majority of the trees have smooth, thin bark because there is no need to protect the them from water loss and freezing temperatures. It also makes it difficult for epiphytes and plant parasites to get a hold on the trunks. The bark of different species is so similar that it is difficult to identify a tree by its bark. Many trees can only be identified by their flowers.

    Despite these differences, each of the three largest rainforests--the American, the African, and the Asian--has a different group of animal and plant species. Each rain forest has many species of monkeys, all of which differ from the species of the other two rain forests. In addition, different areas of the same rain forest may have different species. Many kinds of trees that grow in the mountains of the Amazon rain forest do not grow in the lowlands of that same forest.



    Layers of the Rainforest

    There are four very distinct layers of trees in a tropical rain forest. These layers have been identified as the emergent, upper canopy, understory, and forest floor.

    * Emergent trees are spaced wide apart, and are 100 to 240 feet tall with umbrella-shaped canopies that grow above the forest. Because emergent trees are exposed to drying winds, they tend to have small, pointed leaves. Some species lose their leaves during the brief dry season in monsoon rainforests. These giant trees have straight, smooth trunks with few branches. Their root system is very shallow, and to support their size they grow buttresses that can spread out to a distance of 30 feet.
    * The upper canopy of 60 to 130 foot trees allows light to be easily available at the top of this layer, but greatly reduced any light below it. Most of the rainforest's animals live in the upper canopy. There is so much food available at this level that some animals never go down to the forest floor. The leaves have "drip spouts" that allows rain to run off. This keeps them dry and prevents mold and mildew from forming in the humid environment.
    * The understory, or lower canopy, consists of 60 foot trees. This layer is made up of the trunks of canopy trees, shrubs, plants and small trees. There is little air movement. As a result the humidity is constantly high. This level is in constant shade.
    * The forest floor is usually completely shaded, except where a canopy tree has fallen and created an opening. Most areas of the forest floor receive so little light that few bushes or herbs can grow there. As a result, a person can easily walk through most parts of a tropical rain forest. Less than 1 % of the light that strikes the top of the forest penetrates to the forest floor. The top soil is very thin and of poor quality. A lot of litter falls to the ground where it is quickly broken down by decomposers like termites, earthworms and fungi. The heat and humidity further help to break down the litter. This organic matter is then just as quickly absorbed by the trees' shallow roots.



    Plant Life

    Besides these four layers, a shrub/sapling layer receives about 3 % of the light that filters in through the canopies. These stunted trees are capable of a sudden growth surge when a gap in the canopy opens above them.

    The air beneath the lower canopy is almost always humid. The trees themselves give off water through the pores (stomata) of their leaves. This process, called transpiration, can account for as much as half of the precipitation in the rain forest.

    Rainforest plants have made many adaptations to their environment. With over 80 inches of rain per year, plants have made adaptations that helps them shed water off their leaves quickly so the branches don't get weighed down and break. Many plants have drip tips and grooved leaves, and some leaves have oily coatings to shed water. To absorb as much sunlight as possible on the dark understory, leaves are very large. Some trees have leaf stalks that turn with the movement of the sun so they always absorb the maximum amount of light. Leaves in the upper canopy are dark green, small and leathery to reduce water loss in the strong sunlight. Some trees will grow large leaves at the lower canopy level and small leaves in the upper canopy. Other plants grow in the upper canopy on larger trees to get sunlight. These are the epiphytes such as orchids and bromeliads. Many trees have buttress and stilt roots for extra support in the shallow, wet soil of the rainforests.

    Over 2,500 species of vines grow in the rainforest. Lianas start off as small shrubs that grow on the forest floor. To reach the sunlight in the upper canopy it sends out tendrils to grab sapling trees. The liana and the tree grow towards the canopy together. The vines grow from one tree to another and make up 40% of the canopy leaves. The rattan vine has spikes on the underside of its leaves that point backwards to grab onto sapling trees. Other "strangler" vines will use trees as support and grow thicker and thicker as they reach the canopy, strangling its host tree. They look like trees whose centers have been hollowed out.

    Dominant species do not exist in tropical rainforests. Lowland dipterocarp forest can consist of many different species of Dipterocarpaceae, but not all of the same species. Trees of the same species are very seldom found growing close together. This bio diversity and separation of the species prevents mass contamination and die-off from disease or insect infestation. Bio diversity also insures that there will be enough pollinators to take care of each species' needs. Animals depend on the staggered blooming and fruiting of rainforest plants to supply them with a year-round source of food.
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    Post by floppyjacky on Mon Jun 01, 2009 12:18 am

    Seismologist Richard Oldham determines that earthquake waves move through the central part of the Earth much slower than through the mantle around it. He surmises that the Earth has a core composed of liquid.

    2. Earth's Inner Core (1930s)In 1936, Inge Lehmann documents that some seismic waves from deep inside the Earth's core do not pass through, but are reflected back. It becomes clear that the Earth has an inner core consisting of a small, solid iron sphere that is surrounded by a thick outer core composed of liquid iron.

    3. Continental Drift (1911)
    Alfred Wegener proposes that all the continents in the world once formed a single, giant landmass that was eventually split apart in a process called "continental drift." Wegener's evidence consists of the "fit" of South America with Africa, fossil distribution and geological similarities.

    4. Seafloor Spreading (1950s – 1960s)
    Adding his own data on changes in seafloor depth and geology to discoveries of his peers, Harry Hess proposes that Wegener's theory of continental drift is a result of seafloor spreading. He hypothesizes that molten magma from beneath the Earth's crust is oozing up between the plates in the Great Global Rift (now referred to as the Mid-Ocean Ridge). As the hot magma cools, it expands and pushes the plates out from the rift, causing the Atlantic Ocean to get wider over time.

    5. Plate Tectonics (1960s)
    The work of many scientists reveals that the Earth's surface is broken into several interconnected plates of rock. Earth's outermost layer, the lithosphere, is broken into at least seven large, rigid pieces. These plates are moving in different directions and at different speeds (about 1 to 4 inches per year) and are crashing together, pulling apart and sideswiping each other. All the action at plate boundaries produces phenomena such as mountains, volcanoes and earthquakes.

    6. Troposphere and Stratosphere (1890s)
    With the aid of scientific instruments placed on unmanned balloons, Leon Teisserenc de Bort discovers that the atmosphere consists of layers. Bort notices that air temperature decreases steadily up to about seven miles, but remains constant at higher altitudes. After more than 200 balloon experiments, he suggests that the atmosphere is divided into two layers called the "troposphere" and the "stratosphere."

    7. Global Warming (late 20th century)
    A number of scientists see evidence of a warming trend on the Earth's surface and attribute it to a rise in the concentration of "greenhouse gases." Global warming theory states that an increase of the average temperature of Earth's atmosphere and oceans since the late 19th century can be attributed to humans and increased emissions of carbon dioxide. According to the theory, temperatures will increase further if emissions of these greenhouse gases continue.

    8. Cosmic Radiation (1911 onward)
    In 1912, Victor Hess travels to 17,500 feet in a hot air balloon (without oxygen) and observes that radiation increases with altitude. Further experiments convince him the radiation is coming from space. We now know that the vast majority of cosmic rays are protons, and therefore have a positive electrical charge.

    9. Magnetic Field Reversal (1906)
    Bernard Brunhes discovers that the Earth's magnetic field has changed direction and reversed itself. His paleomagnetic study of clay baked by a Miocene lava flow 13 million years ago provides the evidence. It is nearly 50 years before his discovery is accepted by the scientific community.

    10. Geological Change (1830s)
    Charles Lyell offers proof that the Earth evolved slowly in his multivolume Principles of Geology: An Attempt to Explain the Former Changes of the Earth's Surface by Reference to Causes Now in Operation, published between 1830 and 1833. In his work, he advocates the then-controversial idea of uniformitarianism — the idea that the Earth was shaped entirely by slow-moving forces acting over a very long period of time. Catastrophism, a geologic idea that uses biblical chronology to date the Earth, was more accepted at the time.

    11. Radiometric Dating (1907)
    Bertram Boltwood discovers how to calculate the age of a rock by measuring the rate of its radioactive decay. His observations and calculations put Earth's age at 2.2 billion years. Although we now think the Earth is nearly twice that age, this number was a dramatic increase over the accepted age at the time. Boltwood's formulas are compatible with several radioactive elements, including carbon-14, which has been used to date historical artifacts.

    12. Periodic Ice Ages (1930s)
    Serbian astrophysicist Miultin Milankovitch develops a theory relating Earth's motion to long-term climate change and ice ages. His mathematical theory of climate uses variations in solar radiation based on season and latitude. His theory posits that cyclical variations in Earth-sun geometry, such as orbit shape and axis angle, result in different levels of solar energy reaching the Earth.
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    Post by Kool_Man on Tue Jun 02, 2009 5:48 am

    very interesting to!
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    Post by Belugaboy on Thu Jun 11, 2009 1:11 pm

    sonorus wrote:Wow Shocked The water of Angel Falls (the World's highest) in Venezuela drops 3,212 feet (979 meters). They are 15 times higher than Niagara Falls.

    Interesting facts about Earth - Page 2 AngelFalls2

    What amazing facts about Earth do you know?
    The one who gives me the most interesting facts will receive a V-flag afro
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