Sedimentary Rocks
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When loose rocky materials, called sediment, such as sand, mud, or small pieces of rock, pile up over time, they can form sedimentary rock. When a pile of sediment grows, the weight of the top layers increases, and this causes the bottom layers to become very tightly packed, until they eventually join into solid rock. This process can take millions of years! However, it can have huge results...
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The Grand Canyon is made from sedimentary rock!
The formation of the last type of rock can also take millions of years. How else do you think rocks can be formed? Click "next" to find out!