The Sima layer is formed of _ and ___.

silica and argon

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sulphur and magnesium

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silica and magnesium

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sulphur and argon

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Solution

The correct option is D silica and magnesium
The Sima layer is formed of silica and magnesium. This layer is below top layer and made up of basalt rock which is heavier than the topmost layer. The density of the layer varies from 3.1 to 5.00. the average thickness of this layer is 100 to 2900 km.

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