Heat and Pressure
The atoms in rocks rearrange to form bigger and heavier minerals. The combination of heat and pressure may cause the minerals in the rock to split into layers. Metamorphic rocks begin changing at temperatures of 100 degrees Celsius to 800 degrees Celsius. If you squeeze and heat a rock for a few million years, it can turn into a new kind of rock.
The pressure comes from many layers of rock piling on top of eachother, and the heat comes from magma. It's like putting blankets on yourself - the more you layers you put on, or the more blankets you put on, the more pressure you recieve because of all the weight of the layers on top of you.
The pressure comes from many layers of rock piling on top of eachother, and the heat comes from magma. It's like putting blankets on yourself - the more you layers you put on, or the more blankets you put on, the more pressure you recieve because of all the weight of the layers on top of you.
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