How are radio telescopes different from the keck telescope

The keck observatory is comprised of several optical reflecting telescopes where as a radio telescope consists of a large parabolic solid metal or screen reflector with a radio receiver at its foucus but to detect and measure radio waves

Ithink it’s bill gates.

The one that most represents the earths mantle would be the skin since the mantle is the upper part of the earths depths which is just like the skin of an apple.