Rocky material from the Earth's interior can reach the surface, and be pushed and folded upward during the process of . One of the processes that works to return this material back to the Earth's interior is .
A.
erosion; mountain building
B.
weathering; mountain building
C.
weathering; erosion
D.
mountain building; erosion

Rocky material from the Earth's interior can reach the surface, and be pushed and folded upward during the process of mountain building. One of the processes that works to return this material back to the Earth's interior is erosion.

Explanation:

The process of mountain building is known as Orogenesis. The Greek word Orogenesis derived from Oros means mountain and Genesis means formation. Due to the tectonic movements sometimes earth's interior's materials pushed to the earth's surface and get folded and rise upward this is known as mountain building. In this way fold mountains are formed.

When the newly formed folded structure undergo some sorts of changes due to the erosional activities by the agents of nature like air, water, glacier etc. known as erosion.  

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force