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Type of rocks (Igneous Rocks:are formed by the cooling and solidification…
Type of rocks
Igneous Rocks:are formed by the cooling and solidification of magma or lava.They make up 80% of the Earth's surface in both the continental and the ocean crusts. Based on how and where the magma solidifies, it is possible to identify three types of magmatic rocks: intrusive or plutonic, subvolcanic and volcanic.
Intrusive Rocks:are formed by the slow cooling of magma under the Earth's surface.Like is the granite or syenite
Granite 
Syenite
Subvolcanic Rocks:are formed when magma hardens close to the surface in cracks in the Earth's crust after a period of slow cooling deep inside the Earth.Like Pegmatite
Pegmatite
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Sedimentary Rocks: are formed by the settling accumulation and consolidation of sediments or by the precipitation of minerals from a solution.They are classified in clastic, chemical or biochemical.
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Chemical Rocks : they are formed by chemical processes.Depending on their composition,they are classified as carbonates or evaporites.Like limestone
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Biochemical Rocks :Biochemical sedimentary rocks form from the gradual accumulation of the remains of living things, Like coralline
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Metamorphic Rocks: They are produced from all types ofpre-existing rocks, which are transformed by being subjected to high heat, high pressure or a combination of both factors .Metamorphic rocks are classified as foliated or non-foliated.
Foliated Metamorphic Rocks: appear banded or layered..This parallel arragement of new mineral in sheets or layers is called foliation.Some examples are slate,or,gneiss
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NOn -Foliated Metamorphic Rocks: They usually contain just one mineral.They are uniform in texture.Like marble
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