fire
dano m8 soz
Grainy rocks not only absorbs water better than crystal rocks, but it filters the water as well.
i would say sunlight.
Almost all rock is porous to some extent and therefore will absorb some water from any source.
when water is absorbed by rocks, and freezes, it will expand. therefore the rock will crack. Their bulk density increases (as the mass of the water contributes to the total mass of the rock) and the...