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when rock rub together by water
Rock salt is not as pure. There is often foreign material left from when they scraped it up from the ground. Food grade salt is much cleaner and it includs iodine which is there to prevent thyroid problems. You can still get coarse salt that is considered "food grade". If you are using it to melt snow use the rock salt its cheaper and the larger grains give better traction
a rock ?
River rock should not be used for paving a driveway. Due to its smooth surface it is not stable enough, it will shift which makes it a poor choice for a driveway.
An insulator is a poor conductor of energy. For example; Rubber is a poor conductor of electricity Rock is a poor conductor of heat A sponge is a poor conductor of sound.
You are using rock.
Metamorphic. Obsidian.
You should get rock band 2
Moltres is resistant to Fire moves, you should try using Rock, Water or Electric moves against it.
None. Basalt is formed by the rapid cooling of mafic (silica-poor) magma. It is not formed from sedimentary rock.
Rock crystal.
cools down slowly