Dinopedia
Advertisement

A rock is a naturally occurring aggregate of one or more minerals.  For example, the common rock granite is a combination of quartz, feldspar, and biotite minerals.  Rocks are broken down into three groups:  igneous, sedimentary, and metamorphic.  Igneous rocks come directly from volcanoes, sedimentary rocks are layered in the ground and are where fossils are found, and metamorphic rocks are caused when heat transforms old rocks into new rocks.

Rock
Advertisement