What is Planet Earth 4

What is Planet Earth 4 - Water & Land The Earth is...

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•The Earth is mostly water •¾ of the Earth is covered in water •The big bodies of water on Earth are called oceans •The big pieces of land on Earth are called continents Why is Earth a water planet? Basically because of its distance from the sun, its atmosphere, and because of the daily (rotation) and annual (revolution) temperature changes related to the orbit around the sun. These factors not only account for water on planet Earth, but also water’s existence as solid, liquid, as gas forms. For example, Mars lacks an atmosphere and cannot retain heat; therefore, only solid water (that is, ice) exists on Mars now. Without the ability to have water in all three phases, life as we now could not exists on Earth. There is also positive feedback between the atmosphere, ocean, and land. Water and land differentially heat up and cool off; meaning that, land will heat up very fast and cool off very quickly, whereas water heats up slowly and retains that heat for a very long time. You can observe this consequence of differential heating at the shore of a lake or the at
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What is Planet Earth 4 - Water & Land The Earth is...

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