Sedimentary: Back millions of years ago,
little pieces of earth were either broken donw by wind and water until they were washed down streams. They then end up on
the bottom of rivers, lakes and oceans. Layer after layer of eroded earth are is deposited on top of each other slowly pressed
down more and more, until the bottom layers slowly turn into rock.
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Metamorphic: Any rock can become a metamorphic rock. For that to happen it needs to be put into
an enviornment in which the minerals in the rock become unstable and out of equilibrium with the new environment. Common metamorphic
rocks include slate, schist, gneiss, and marble.