During the process of mountain building,
A.
the Earth's interior often gains material from the atmosphere.
B.
weathering and erosion help to generate igneous rock formations.
C.
material from the Earth's surface is often broken down by crystalization.
D.
material from the Earth's interior is often returned to the surface.

D. material from the Earth's interior is often returned to the surface

Explanation:

The mountains are formed when there is two plates colliding, especially when it comes to two continental plates. Because none of the plates has the tendency to sink below the other plate, their collision creates enormous amount of pressure on the crust around the boundary.

That enormous pressure manages to push the crust upward, and slowly mountain ranges start to form as the crust gains on elevation. While this process goes on, lot of material that has been buried deep into the interior of the Earth for millions of years, starts to come out on the surface.

That makes up for lot of disturbance in the rock strata, and makes up fro interesting and unexpected things. A good example of this are the Himalayas, as there are oceanic sediments at the top parts of them, despite the mountains being more than 8,800 meters high.

ask your friends for what they got then copy it down if you don't have any friends which is fine than google it or pay the teacher

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.