Question

Which layer is The coolest? Inner core outer core upper mantle lower mantle

Answer 1

The Earth's temperature rises drastically as one travels deep inside the earth - so the warmest is the inner core, and after this it's the outer core. After this slightly less warm is the lower mantle and only then the upper mantle - which is the correct answer to this queston. But the next layer, the crust, is even colder!