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    Question ID:   7577         Current Version: 1
Question: Why rocks are important in the study of earth?
Category: Science > Earth Sciences
Keywords: important, rock, study, earth
Type: why
Rating:(0 ratings)    Views: 458    Discussions: 0   In Watch Lists: 1  

 
    Answer:

The Earth is made of rock, from the tallest mountains to the floor of the deepest ocean. Rocks are continually changing. Wind and water wear them down and carry bits of rock away; the tiny particles accumulate in a lake or ocean and harden into rock again. The oldest rock that has ever been found is more than 3.9 billion years old. The Earth itself is at least 4.5 billion years old, but rocks from the beginning of Earth's history have changed so much from their original form that they have become new kinds of rock. By studying how rocks form and change, scientists have built a solid understanding of the Earth we live on and its long history.

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