Initially earth was very hot and volcanic. At first the crust was formed as the planet got cooled. The impacts from asteroids and debris were the reason to form lots of craters. As the time went on, the planets continued to cool, forming water on the surface of the Earth. This lead to the formation of oceans. The Earth's surface that we have today is a result of lot of eruptions from volcanoes, earthquakes, and several other factors.
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http://www.wonderwhizkids.com/index.php/planet-earth
read more.....
http://www.wonderwhizkids.com/index.php/planet-earth
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