name the person who discovered Mohorovicio discontinuity

the thickness of the crust is ____________.

the innermost shell is called the lower mantle

Below the crust is the upper mantle, with the upper-most portion referred to as the_______

The upper mantle is only about ______ of the total mantle thickness.

The temperature of the lower mantle ranges from ______.

What is the thickness of the Mantle ?

Although the inner core is very hot, it is not liquid like the outer core.