The correct answer is C. mantle.
The mantle is the largest layer of Earth, making up 84% of its volume. It is a solid layer, but it is very hot and can flow like a very thick liquid. The mantle is made up of silicate rocks, which are rocks that contain silicon and oxygen. The heavier silicates named as ‘Sima’ or silica + magnesium are most abundant in the mantle.
The crust is the outermost layer of Earth. It is a thin layer, making up only about 1% of Earth’s volume. The crust is made up of rocks that are lighter than the rocks in the mantle. The ocean floors are made up of oceanic crust, which is a type of crust that is made up of basalt. Basalt is a type of rock that is rich in magnesium and iron.
The core is the innermost layer of Earth. It is made up of two parts: the inner core and the outer core. The inner core is solid, while the outer core is liquid. The core is made up of iron and nickel.
The mantle is the layer of Earth that is between the crust and the core. It is made up of silicate rocks, which are rocks that contain silicon and oxygen. The mantle is the largest layer of Earth, making up 84% of its volume. It is a solid layer, but it is very hot and can flow like a very thick liquid. The heavier silicates named as ‘Sima’ or silica + magnesium are most abundant in the mantle.