Metamorphic, Igneous, and Sedimentary Rocks and Their Essay

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Metamorphic, Igneous, And Sedimentary Rocks and Their Application to Planets in the Solar System

The objective of this study is to examine metamorphic, igneous, and sedimentary rocks and their application to planets in the solar system.

There are reported to be three primary classes of rocks, which are classified according to their origination. The three rock types are metamorphic, igneous, and sedimentary rocks. Igneous rocks are formed when bodies of magma cool. As time passes and the rocks undergo process due to various weather cycles the igneous rocks erode and the particles and chemicals, which settle into beds, become compressed or cemented forming into what are known as sedimentary rocks. In the event igneous rocks are buried and then undergo a high state of heating and compression they form into what are known as metamorphic rocks. Eventually, the rocks undergo heat and compression and then melt with the molten rock forming another igneous rock in what is referred to as the rock cycle. Rocks may be turned from one type of rock into another rock. For example, it is reported that a sedimentary rock "such as sandstone can be weathered and eroded and those fragments might eventually end up as part of a shale, a different sedimentary rock." (Rocks & Other Mineral Sources, 2012) The following illustration shows the rock cycle that the three primary rocks types undergoes in the changing of rocks from one type to the other.

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Figure 1

Rock Cycle

Source: Nelson (2012)

I. Rock Classes and Types of Rocks

There are two classes of rocks that are formed from magma including: (1) plutonic or intrusive rocks; and (2) Volcanic or extrusive rocks. The types of rocks that are formed from the consolidation of sediments include: (1) biochemical sedimentary rocks; (2) Clastic sedimentary rocks; and (3) evaporative sedimentary rocks. Metamorphic rocks or those formed from heat and pressure include such as: (1) Geniss; (2) marble; (3) quartzite; (4) phyllite; (5) schist; (6) serpentine; (7) slate; and (8) soapstone. The following illustration shows the development or formation of slate.

Figure 1

Formation of Slate

Source: Nelson (2012)

Specific igneous rocks include in the intrusive class those of: (1) granite; (2) quartz; (3) potassium; (4) sodium-rich feldspar; (5) mica gabbro; (6) dark rock of calcium-rich feldspar; (7) pyroxene perodotite; and (8) dark rock, mostly olivine. Igneous rocks of the extrusive type include basalt, which is a fine-grained equivalent of a gabbro. Two common terrestrial sedimentary rocks are reported to be those of sandstone and limestone. Sandstone is formed "from compressed sand grains" and limestone is "produced when deposits of calcium carbonate (CaCO3) precipitate out of solution in water. Limestone's formation is similar to the "mineral bathtub rings left when water evaporates out of a tub.".....

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