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The Sima layer is made of _________ and___________.
A) Silica and Argon
B) Sulphur and Magnesium
C) Silica and Magnesium
D) Sulphur and Argon

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Last updated date: 16th Jul 2024
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Answer
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Hint: The crust, mantle, outer core, and inner core are the four main components that make up the earth's structure. Each layer has its own chemical composition and physical state, and it has the potential to affect life on the planet's surface.

Complete answer:
A rocky planet, dwarf planet, or natural satellite's crust is the outermost stable shell of geology. It can typically be differentiated from the underlying mantle by its chemical composition; however, icy satellites can be distinguished by their phase (solid crust vs. liquid mantle). The crusts of most terrestrial planets are fairly uniform. However, there are two kinds of crust on Earth: continental crust and oceanic crust. The chemical compositions and physical properties of these two forms vary, and they were formed by different geological processes.

The crusts of most terrestrial planets are fairly uniform. However, there are two kinds of crust on Earth: continental crust and oceanic crust. The chemical compositions and physical properties of these two forms vary, and they were formed by different geological processes.

Sima is an old geological term for the lower layer of the Earth's crust. This layer is made up of magnesium silicate minerals-rich rocks. Since the sima usually reaches the surface as basalt, this layer is often referred to as the crust's "ocean layer". The layer's density ranges from $3.1$ to $5.0$. This layer's average thickness ranges from $100$ to $2900$ kilometres. Since it is the lowest layer of the crust, the sima layer is also known as the 'basal crust' or 'basal layer'.

Thus the correct answer is option ‘C’.

Note: The first two letters of silica and magnesium were combined to form the name 'sima'. The name 'sial', which refers to the upper layer of the Earth's crust, is comparable. The ocean crust is also known as the 'oceanic crust' because the ocean floors are mostly sima.