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Metamorphic rocks

Metamorphic rock

“Metamorphic Rocks” are formed from the older rocks when they are subjected to increased temperature, pressure, and shearing stresses at considerable depth in the earth’s crust. The older rocks may be either sedimentary, igneous, or other metamorphic rocks. During metamorphism, recrystallization takes place essentially in the solid-state and new minerals and new textures are produced. …

Sedimentary Rocks and their formation

Sedimentary rock formation

Sedimentary Rocks The upper 16 km thick earth’s crust contains only 5% of the sedimentary rocks, while the percentage of the sedimentary rock in the exposed rocks is about 75%. These rocks are found chiefly as an extensive cover over the continental crust. In the subject of rock formation, sedimentary rocks and their formation is …