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Sprout
Sedimentary rocks... like sandstone
Wed Mar 8, 2017 10:39am
192.86.118.187

do in fact start as sediment, get compressed into rock, and then, if exposed to the elements, often get broken back down into sediment again, and depending on the circumstances could theoretically be cycled back deep enough to become sedimentary rock again.

Igneous rock has a very different cycle... one that isn't particularly cyclic at all.. Igneous rock is extruded from beneath the earth and if exposed to the elements is broken down into sediments. If it is not take back down below the crust by plate tectonics it won't ever go back to its beginning.

Metamorphic rock can have an even more interesting cycle.

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