Are all the rocks on the earth the same ones that have always been there, or do we get new rocks sometimes?
In: Earth Science
Rocks are when a bunch of minerals stick together.
There’s rock that forms from volcanoes where it all melts and then cools and hardens, and then there’s sedimentary rock that forms at the bottom of the sea from all the stuff that sinks to the bottom. This rock tends to be more crumbly as it’s just the pressure of lots of water that squishes it together.
Finally, there’s subduction rock that forms inside the earth’s mantle when all the debris gets pulled down underneath the surface and heated to insane temperatures and pressure: it’s kind of a combination of the first two. This is how you get rocks like granite where quartzite crystals are embedded in basalt.
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