The answer is d according to study soup
Answer:
The outer core is the third layer of the Earth. It is the only liquid layer, and is mainly made up of the metals iron and nickel, as well as small amounts of other substances. ... These powerful currents cause lines of invisible force to stretch around the Earth and thousands of miles into space, creating a magnetic field.
C
in the first paragraph a fact is challenged
and the second one provides an example
Answer:
fsst carbon cycle is the answer
