The mantle:

1) is made of solid rock
2) contains more iron than the crust
3) is as hot as the surface of the sun
4) all of the above

C.about 10% i think

Master planned communities outside of chicago. note: population density means people living in an area per square mile. chicago, an urban and highly populated area has a much more higher density than a desert, amish community, settlement, or nomadic region.