Question

2.
What is meant by Sima and Sial?​

Answer 1

Answer:

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Explanation:

In geology, sima (/ˈsaɪmə/) is an antiquated blended term for the lower layer of the Earth's crust. This layer is made of rocks rich in magnesium silicate minerals. Typically when the sima comes to the surface it is basalt, so sometimes this layer is called the 'basalt layer' of the crust. The sima layer is also called the 'basal crust' or 'basal layer' because it is the lowest layer of the crust. Because the ocean floors are mainly sima, it is also sometimes called the 'oceanic crust'.

In geology, the term 'sial' refers to the composition of the upper layer of the Earth's crust, namely rocks rich in silicates and aluminium minerals. It is sometimes equated with the continental crust because it is absent in the wide oceanic basins,[1] but "sial" is a geochemical term rather than a plate tectonic term.[2] As these elements are less dense than the majority of the earth's elements, they tend to be concentrated in the upper layer of the crust.

Answer 2

Answer:

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