Metamorphic Rocks and Their Formation

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When an igneous or sedimentary rock is subjected to intense heat and pressure, it can transform into a metamorphic rock. This process involves the minerals within the rock becoming squishy and rearranging themselves into a new rock without melting completely. For example, limestone at the bottom of the ocean can turn into marble through metamorphism as the grains of calcium carbonate from shells meld together. Some examples of metamorphic rocks include marble. Extrusive volcanic igneous rocks include basalt, pumice, and obsidian, while intrusive rocks like granite, diorite, and pegmatite form beneath the earth's surface, cooling slowly to allow crystal formation.

What is a rock? How big is a boulder? Why are they pretty and heavy? It’s rock talk with a true enthusiast, the charming and beloved Geologist Schmitty Thompson. Schmitty walks us through different types of rocks, minerals, geological formations, roadside wonders, countertop crystals, stone skipping, and why you should stare lovingly into a pit of gravel. There were so many listener questions, we had to make this a two-parter people. So roll up a boulder, take a seat, and enjoy Schmitty’s Geology Corner. Also: losing my marbles.