Igneous, igneous rocks are formed when magma (molten rock deep within the earth) cools and hardens.Examples of this rock type include basalt and obsidian.Geology Dictionary Geology Dictionary - contains thousands of geological terms with their definitions.

Rocks telykt

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Rock Art Rock Art People have been producing rock art for thousands of years.The percentage of minerals in a rock determines its mineral composition.The Rock Used to Make Beer - Geologists are beer experts and should know about this rock.

Metamorphic rocks are formed deep in the earths crust as a result of the alteration (metamorphism) of sedimentary or igneous rocks.Magmatic and metamorphic rocks constitute about 90 percent of the volume of the earths crust, with the other 10 percent falling to sedimentary rocks, although sedimentary rocks occupy 75 percent of the area of the earths surface.Read before you buy a tumbler.