These rocks are one of the three main rock types. They are formed through the cooling and solidification of lava. The following is an igneous rock called Obsidian.
Metamorphic Rock:
These rocks form from a change in a current rock type. The previous rock is exposed to heat and pressure causing the change. The following is a form of metamorphic rock called slate.
Sedimentary Rock:
These rocks form from a sedimentation of minerals and other soils and rocks. These may also form in bodies of water. The following is an example called sandstone.
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