Mystery #1Tier 2how rocks form

Rocks seem like they have always just been there, so how are new ones made?

Look at a stone wall, a mountain, a pebble on a path. It feels like the rocks were simply always there, part of the furniture of the world. But every single one had to be made somehow, somewhere. So how does the Earth make a brand-new rock?

A great face of pink granite in a quarry, rock that began as molten stone deep underground and cooled slowly into crystals — Photo: W.carter · CC BY-SA 4.0 · via Wikimedia Commons

Your guess

What do you think? Where does a brand-new rock actually come from?

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