Earth's crust is composed of several types of stones each of which is made up of 1 or more mineral. The rocks can be classified into 3 basic kinds:
1. Igneous Rocks
2. Metamorphic Rocks
3. sedimentary Rocks
Igneous rocks are the most common rock noticed on crust of the earth. It forms when the magma
crystallizes and cools the intrusive igneous rocks (sub-surface) or the lava crystallizes and cools on the extrusive igneous rock (surface rock) of the
earth. The granite is an illustration of intrusive rocks and basalt is an example of rock on earth.
The sedimentary rocks are formed by the integration of the endured fragments of pre existing rocks (stones) by the breakdown of minerals or by concretion of living organism remaining. This action involves endured rock fragments let in transport and erosion by wind, H2O or water ice followed by deposition as sediment deposits.
The metamorphic rocks are formed once solid phylogenic, the metamorphic or the sedimentary rocks change in reply to raised chemical active fluids or/and pressure and temperature and this alteration generally occurs on sub surface. This may involve alterations in recrystallization (texture) and a change in both or mineralogy.
Rock cycle diagram explains the connections in-between the earth's external and internal actions and how the 3 basic rock groups are related to 1 other. The internal processes let in metamorphism and melting due to elevated pressure and temperature. The convective flows in the mantle keep the earth crust in constant movement. The buried rocks are brought to the surface. Sediments and surface rocks are transported to the top mantle area.
The 2 significant external actions in the rock cycle are erosion and weathering. The weathering is the action by which rock substances are made into smaller pieces or/and chemically varied. When the rock materials are broken up into smaller parts, it can be transported elsewhere in an action known as erosion and the important transportation of erosion is moving H2O, just glaciers and wind can as well erode the rocks.
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|Energy & its Types||Rock Cycle|
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