explain the three manor major groups of rocks along with the sub types which are found in earth's lithosphere (250 words)
Answers
Answer:
All the three types of rock namely Igneous, sedimentary and metamorphic make up the Earth's lithosphere, the outermost layer. The lithosphere is solid rock. Sedimentary rocks are the most abundant rock only on the surface of the Earth, but igneous and metamorphic are abundant deeper into the mantle.
☆ANSWER☆
》Just like minerals are the building blocks of rocks, rocks in turn are the natural building blocks of the Earth's LITHOSPHERE.
✪IGNEOUS ROCKS
》 They are Formed by crystallization from molten or partially material, called MAGMA.
》 There are two subclasses of igneous rock, VOLCANIC and PLUTONIC .
◇VOLCANIC ROCKS :-
》They form at the Earth's surface. They cool and crystallized from magma which has spilled out onto the surface at a volcano.
◇PLUTONIC ROCKS :-
》They form from magma that cools and crystallizes below the Earth's surface. In a sense, this is the portion of the magma that never makes it to the surface.
》 For the plutonic rock to become exposed at the surface, it must be tectonically uplifted and the overlying material must be removed by erosion.
✪SEDIMENTARY ROCKS
》They form from material that has accumulated on the Earth's surface.
》 And like the plutonic rocks, sedimentary rocks which were lithified below the surface only become exposed at the surface by tectonic uplift and erosion of the overlying material.
✪METAMORPHIC ROCKS
》They form when a sedimentary or igneous rock is exposed to high pressure, high temperature, or both, deep below the surface of the Earth. The process, METAMORPHISM, produces fundamental changes in the mineralogy and texture of the rock.
》The first protolith was either a sedimentary or igneous rock. Because all metamorphic rocks form below the surface, for them to become exposed at the surface, they must undergo tectonic uplift and removal of the overlying material by erosion.
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