Question

Based on data provided by seismic waves, which statement is true about the internal structure of the earth?
A. The core is solid, and the mantle is both solid and liquid.
B. The crust and core are both solid, and the mantle is liquid.
C. The crust is solid, the mantle is semisolid, the outer core is liquid and the inner core is solid.
D. The crust is solid, the mantle is semisolid, the outer core is solid, while the inner core is liquid.​

Answer 1

The crust is solid, the mantle is semisolid, the outer core is liquid and the inner core is solid.

Option (c) is correct.

Explanation:

• The examination of the internal structure of the earth suggests that it is composed of crust asthenosphere and mantle.
• The crust is the lithosphere which is the outer part of the earth.
• Below the lithosphere is the asthenosphere which is made up of hot viscous liquid. It is basically mantle which is a semisolid liquid.
• The outer core of the mantle is in liquid form while the inner core is solid.