Livre - Rocks and Minerals

[ Rocks are naturally-occurring consolidated substances, which may be made up of minerals, other rock pieces, and fossil materials, such as shells or plants. Rocks are the result of various geological processes that occur both at and beneath the Earth’s surface or, in the case of meteorites, in other parts of the Universe. Rocks can be studied and  differentiated between by grouping together those types that share a similar appearance, similar composition, and the same process of formation...]