Earth's Structure — Flashcards

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Earth is composed of three parts: crust, mantle, and core. These layers differ in thickness, composition, temperature, pressure, and density.

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The crust is the outermost layer of the Earth. It is about 6 to 48 km thick, and the glossary also gives a thickness range of 5 to 60 km. It is the thin upper shell made of rock.

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Lithosphere is the name used for the crust. The word comes from the Greek word Lithos, meaning rock. It refers to the Earth’s outer rocky layer.

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Sial is the upper or continental layer of the crust, made mainly of silica and aluminium. Sima is the lower continuous layer of the crust, made mainly of silica and magnesium.

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It is called Sial because silica and aluminium are the main materials present in it. Its composition is like granite, and its density is about 2.7.

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It is called Sima because silica and magnesium are the main materials present in it. Its composition is similar to basalt, and its density is about 2.95.

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Sial is the upper, discontinuous, lighter layer of the crust, while Sima is the lower, continuous, heavier layer. Sial has density about 2.7, while Sima has density about 2.95. Sial is like granite, a…

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In continental areas, the granitic and basaltic layers together reach about 45 to 48 km thickness. Under the ocean floor, the basaltic layer is the thinnest part of the crust. The crust is thickest be…