Question

1.Sima layer is composed of

silica and aluminium

silica and magnesium

silica and iron

silica and potash

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Answer 1

Answer:

Explanation:

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.