Question

8 what is the only entirely liquid layer of the earth?
a the upper mantle
b the outer core
c the inner core
d the lower mantle

Explanation:

The Earth's layers:

• The upper mantle is semi - solid (asthenosphere is partially molten but not entirely liquid).
• The outer core is in a liquid state due to high temperatures and pressure conditions that keep it molten (composed mainly of iron and nickel).
• The inner core is solid because of extremely high pressure despite high temperatures.
• The lower mantle is solid (with some degree of plasticity but not liquid).

Answer:

B. The outer core