Question

sial floats over Sima layer. give reasons

Answer 1

https://answers.yahoo.com/question/index?qid=20090825062547AAMWEup
Why does SIAL float over SIMA? | Yahoo Answers

Answer 2

Reason why SIAL floats over SIMA layer:

The full form of the SIAL is Silica and Aluminum. The most of the upper layer of the earth is composed of the SIAL. The full form of the SIMA is Silica and Magnesium .The lower portion of the earth is composed of SIMA. The SIAL is much lighter than the SIMA, that’s why the SIAL floats over SIMA layer. SIAL is said to be continental crust and SIMA is called oceanic crust.