The Crust and Upper Mantle Form the ____

Q50: The Earth's core is made up of

Q51: The magnetic poles are displaced about _

Q52: A gravity meter registers _ over ore

Q53: _ is the return of some of

Q54: The asthenosphere may be a partially melted

Q55: Generally, seismic wave velocity decreases with depth.

Q56: Iron-nickel meteorites are an important source of

Q57: The composition of the upper mantle is

Q59: A region held down out of isostatic

Q60: _ is a balance or equilibrium of