D. distinct in chemistry but of very similar density
Answer:
Option C
Explanation:
C= erosion and deposition
A valley is an elongated low area often running between hills or mountains which will typically contain a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over a very long period of time
D= glacial movement
Sinkholes are formed when the land surface above collapses or sinks into the cavities or when surface material is carried downward into the voids. Drought, along with resulting high groundwater withdrawals, can make conditions favorable for sinkholes to form
I think this should be correct, but not sure
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