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Planet Earth Moons: 1 Mass: 5.97 x 10^24 kg Diameter: 7926 miles Year: 365.3 Days Day: 23 hours and 56 minutes Temperature: -125 to +130 degrees F Distance from the Sun: 3rd planet from the sun, 93 million miles We obviously know more about Earth than any of the other planets. Earth is the largest of the four terrestrial planets, the other terrestrial planets being Mercury, Venus, and Mars. By terrestrial planet, we mean that Earth has a hard rocky surface. The composition of the earth is similar to other terrestrial planets in that it has an iron-core which is surrounded by a molten mantle which, in turn, is surrounded by an outer crust. We live on top of the crust. There are many things that make Earth unique among the Solar System's planets. First, Earth is the only planet that we know of that contains life. Not only does earth contain life, but it supports millions of different forms of life. Another difference is that the Earth is mostly covered with water. Around 71% of the Earth is covered with salt water oceans. Earth is the only planet that has water in liquid form on it's surface. Also, the Earth's atmosphere is made up of mostly nitrogen and oxygen while Venus' and Mars' atmospheres are made up mostly of carbon dioxide. The earth has seven large land masses called continents. It also has 5 major bodies of water called Oceans. The highest point above sea level on Earth is Mount Everest and the lowest point is the Mariana Trench. Planet Earth is made up of a number of elements. There are 5 major elements that actually make up for 10% or more of the Earth's mass. They are iron at 32%, oxygen at 30%, silicon at 15%, and magnesium at 14%. Interesting to note that over 60% of the Earth is made out of iron and oxygen. Earth has one moon or natural satellite. You've probably seen it! The Earth's moon is the fifth largest moon in the solar system. Fun Facts: You may think that the earth is a perfect circle, but it is actually an oblate spheroid. This is because the middle of the Earth or the equator bulges out slightly due to the spin of the Earth. For more information on the Solar system: The Solar System The Sun Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto Back to Kids Study Page Back to Ducksters Kids Home Page

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