3 What is the Earth’s crust made up of? Look at the story of rocks and answer the questions.
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Hello! I am a rock, the main member of the Earth’s crust.
We were formed when the magma ejected by a volcano cooled and hardened into rocks.
The Earth was formed about 4.5 billion years ago.
We rocks have changed into different types because of volcanic eruptions, changes in the Earth’s crust and other factors, such as high temperatures and sedimentation.
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Some rocks broke into soil after being exposed to wind and rain for many years.
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Parts of the crust are covered by water. They form rivers, lakes and oceans.
Therefore, people can find rocks and soil on the crust.
(1) What is the Earth’s crust mainly made up of? (2) How is soil formed?
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