there are 3 types of rocks: metamorphic rocks, sedimentery rocks and igneous rocks.
Metamorphic Rocks
Metamorphic rocks are rocks that have "morphed" into another kind of rock. These rocks were once igneous or sedimentary rocks. The rocks are under tons and tons of pressure, which means heat builds up, and this causes them to change. If you look at metamorphic rock samples closely, you'll discover how flattened some of the grains in the rock are.
Sedimentery Rock
For thousands, even millions of years, little pieces of our earth have been eroded and worn away by wind and water. These little bits of our earth are washed downstream where they settle to the bottom of the rivers, lakes, and oceans. Layer after layer of eroded earth is deposited on top of each. These layers are pressed down more and more through time, until the bottom layers slowly turn into rock.
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