Metamorphic rocks- those that change from one form to another through the processes of heat or pressure beneath the crust of the earth before being returned to the surface- help teach us a lot.
The primary form of rock on the planet is sedimentary rock, which forms at or near the surface, with eroded rock particles gradually compacting into new layers of rock. While this lacks the heat inherent in magmatic or metamorphic rock, they are capable of containing mineral deposits.
Perce Rock in eastern Canada is a good example of a sedimentary rock land formation.
A video display features various land formations of sedimentary rock.
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