Question

what do you mean by concentric?
what do you understand by strata ?
Write a different between sial and sima?


please tell this answer .
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Answer 1

Explanation:

1. used about circles of different sizes) having the same centre point.

2. A stratum of society is a group of people in it who are similar in their education, income, or social status. ... Strata are different layers of rock.

3. Sial is composed of silicon and aluminium.It is upper layer which forms a discontinuous cover over the Earth's crust and is entirely absent the ocean floor. Sima is composed of silicon and magnesium. This is the second layer below sial which forms the ocean base. It is also called oceanic crust.

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