What:

"For any readers who might not know, sedimentary rocks come from sand/mud/etc being deposited and then squished a whole lot over millenia to turn them into rock. Different from igneous rocks, like granite, that come from the rock melting of volcanic activity and metamorphic rock that are normal rocks that have been squished and pressurized even more due to plates colliding. Metamorphic rocks are like the superhero versions of sedimentary and igneous rocks. Super hard and durable slate (for roofs and sidewalks) is the metamorphic version of mudstones, statue-making marble the metamorphic version of soft, sedimentary limestone."

Writer: Jenny Hoople

LCC:

Where:

Date: Dec 9 2014 2:58 PM