Igneous rocks form from the solidification of molten magma or lava. This process can take anywhere from a few days to millions of years, depending on whether the magma cools slowly underground (intrusive igneous rocks) or rapidly on the Earth's surface (extrusive igneous rocks). The cooling rate affects the texture and crystal size of the rock, with slower cooling allowing for larger crystals to form.
Millions and millions of years
how long does it take to make a crayons
6minute
Rock caverns are not built they are eroded out of solid rock by natural processes.
2 weeks
a 100 years
10,000,000+ years
thousands to millions of years
a very long time
As long as you make it take.
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It depends on the size and type of rock. In a recycling facility, rocks would likely be sorted out and reused rather than broken down and recycled. If a rock is broken down for recycling purposes, it could take a long time due to the hardness and composition of the rock.