Question

Which layer of Earth’s mantle is the hottest?

Asthenosphere
Atmosphere (not a part of mantle)
Lithosphere
Mesosphere

Answer 1

A is the hottest out of those 4 but it would be the inner core .

Answer 2

Answer: Asthenosphere

Explanation: The temperature and pressure of the asthenosphere are so high that rocks soften and partly melt, becoming semi-molten. Which means that this makes it the hottest layer of Earth's mantle.