How rocks are formedStone is a very hard thing, and usually black. many kinds of stones based on the content and the way the establishment. how hard rock can be formed?
in the rock world is divided into two, namely natural stone and stone mountain. natural stone in the world was formed after the liquid magma in the earth crust. and most of the earth's surface into a hard black rock. but after the moss growing on the stone surface of the earth becomes obsolete. a small native stone in the ground. while the volcanic rocks formed after the eruption of a volcano eruption. boiling magma does not reach the surface of the earth or intrusive eruption will form the hard rock beneath the ground, while the eruption extruded to form solid rock in the earth's surface.
it is the process of stone formation.
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