Question

dial comprises lighter rocks like silica and magnesium. true or false​

Answer 1

Answer:

The ocean floors are made up of silica and magnesium, and are therefore also called sima (si-silica and ma-magnesium). Sial extends as far as 35 km. It is much thicker than sima, which is barely 5 km thick.

Explanation:

Answer 2

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On an average, the thickness of sial is till 25 km from the surface. The continents are composed mainly of lighter Rock material formed from silicon and Aluminium, so the sial Is thick over the continents and very thin or absent on the ocean floor especially the Pacific Ocean. Average density of sial is 2.7 gm/cc.

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