Q. Which layer has the lowest density among all the layers of the Earth's crust?
Answer: Sial
Notes: The Sial is the uppermost layer of the earth's crust. It has the lowest density among all the layers. It's density ranges from 2.75 and 2.90

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 89 in Geology Geological Time Earths Internal Structure in above course in App.