วันศุกร์ที่ 14 กันยายน พ.ศ. 2550

Rock


This balancing rock, "Steamboat Rock" stands in Garden of the Gods park in Colorado Springs, CO

A rock is a naturally occurring aggregate of minerals and/or mineraloids. The Earth's lithosphere is made of rock. In general rocks are of three types, namely, igneous, sedimentary, and metamorphic. Petrology is the scientific study of rocks.

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