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These rocks in the river are very slowly eroding away.
Eventually the pieces will from together during compaction & cementation and form a sedimentary rock.
Weathering is another cause of movement of sediments.
It is really we out here!
Metamorphic rocks are formed when rocks under-go heat and pressure.
Igneous rocks are formed when lava or magma cools.
Intrusive igneous rocks are formed inside the earth and they aren't glass like extrusive.
Extrusive igneous rocks are glassy because when the lava is cooling after an eruption heats it up it cools really fast.
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