Which part of earth's interior is believed to consist mostly of iron and nickel?
a. inner core
b. outer core
c. mantle
d. crust

Inner core

crust is the ground
mantle is the second layer
out core is the third layer
inner core is the central

B. outer core

The outer core is molten liquid and is 2000 km thick. It is made of iron and nickel and it causes Earth's magnetic feilds.

Social darwinism refers to the the theory that people who succeed in our economic system will one day out compete those who fail. one day the rich will out succeed the poor so we'll that there will eventually be no more poor