The Earth has ____ layers. We live on the very top of the ____ on what is known as the ____. Below the crust is a much thicker layer called the ____. The centre of the Earth is divided into ____ zones: the ____ and the ____. We know that the Earth's crust contains many different kinds of ____ and ____.No matter where you live, you will find rocks and minerals on the ____. These rocks and minerals are ____ to what happened millions of ____ ago in Earth's history. ____ study these rocks and minerals to help us understand more about the ____.

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