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Types of Rocks

 There are three types of rock.
 
1. Igneous:   these are rocks that solidified directly from molten silicates, which geologists call magma. Examples are: granite, basalt, pumice and flint (which is a form of quartz). 
 
2. Sedimentary:  these are formed when igneous rocks are eroded as a sediment under the sea. Fossils are often found in this layer. Examples are limestone, chalk, sandstone. 
 
3. Metamorphic:    these are made up of igneous and sedimentary rocks of all ages which have been subjected to intense pressure. Examples are: slate, marble, quartzite.