Answer:
Nitrogen and oxygen are by far the most common; dry air is composed of about 78% nitrogen (N2) and about 21% oxygen (O2). Argon, carbon dioxide (CO2), and many other gases are also present in much lower amounts; each makes up less than 1% of the atmosphere's mixture of gases.
It is D because it involves rocks moving.
A. The net force applied will increase.
This is an example of Newton's second law that says that you will need more force to move an object of a lot of mass. F = m×a; F=Force= M= Mass×A= Acceleration
Out of the choices given, enemy nations using sophisticated warfare to overpower the outdated tactics of the empire brought an end to the great West African empire. The correct answer is C.
