Final answer:
The Earth's mantle is not made of rock that is frozen solid, but instead is composed of hot, semi-fluid rock called magma.
Step-by-step explanation:
The statement is False. The Earth's mantle is not made of rock that is frozen solid. The mantle is composed of hot, semi-fluid rock called magma. Magma lies beneath the Earth's crust and is in a state between rock and liquid. It flows slowly over long periods of time and carries heat from the Earth's interior to the surface.
Learn more about Earth's mantle composition