Concept:The Earth’s crust is layered, and moving inward, each layer has a different composition.
Explanation:From the surface downward, the first layer of the crust is
sial, which consists mainly of silica and aluminium.
The next layer is
sima, made up of silica and magnesium.
Below the crust lies the
mantle.
At the very centre is the
core.
So, from the surface to the interior, the correct order is sial, sima, mantle, core.
Answer:D. sial, sima, mantle and core