In geology, Sima (the lower layer of Earth's crust) is made of an assemblage of rocks rich in ________ and magnesium. These two minerals are the most abundance minerals in the oceanic crust.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. silica.
In geology, Sima, the lower layer of the Earth’s crust, is composed mainly of rocks rich in silica and magnesium. These two minerals dominate the oceanic crust, giving it a denser composition compared to the continental crust. Sima is typically made up of basaltic rocks, which are dark and heavy due to their mineral content. This layer plays a crucial role in plate tectonics, as it forms the ocean floor and contributes to the dynamic processes of Earth’s lithosphere.