I believe the answer is B
It is a measurement of population per unit area or unit volume.....
BASIC AND BEST :)
A free enterprise system allows people to open businesses if theywant to. It also allows for businesses to compete with each other.
Answer:
measuring seismic wave activity
Explanation:
the earths interior is made up of a number of layers such qs the crust, mantle, outer and inner cores.
