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Rock Fact Page
To geologists, a rock is a natural substance composed of solid crystals of different minerals that have been fused together into a solid lump. The minerals may or may not have been formed at the same time. What matters is that natural processes glued them all together.
Types of Metamorphic Rocks : Marble Slate Schist Gneiss Quartzite
Metamorphic rocks are created when other types of rocks are transformed due to great pressure and heat within the earth. The meaning of the term ‘metamorphic’, in fact, is ‘changed’. When igneous rocks, or sedimentary rocks, or even metamorphic rocks get buried very deep under the earth’s surface, a process that takes millions of years, they get changed into something else by the enormous pressure and heat inside the earth. Some examples of metamorphic rocks are: Limestone being changed into marble Shale turning into slate Granite being changed into gneiss Sandstone turning into quartzite
Rocks have had a huge impact on the cultural and technological advancement of the human race. Rocks have been used by Homo sapiens and other hominids for more than 2 million years. Lithic technology marks some of the oldest and continuously used technologies. The mining of rocks for their metal ore content has been one of the most important factors of human advancement, which has progressed at different rates in different places in part because of the kind of metals available from the rocks of a region.
Rocks are classified by mineral and chemical composition, by the texture of the constituent particles and by the processes that formed them. These indicators separate rocks into igneous, sedimentary and metamorphic. They are further classified according to particle size. The transformation of one rock type to another is described by the geological model called the rock cycle.
