Which of the following best illustrates a natural process acting as a constructive force? A.
A river eroding soil during a flood.
B.
Wind depositing sand to build up sand dunes.
C.
Acid rain breaking down the surface of a rock.
D.
A glacier weathering a mountainside.

Which of there factors contributed most to us westward expansion in the second half of the nineteenth century?

Imagine you work as a consultant, and your daily job involves listening to the constructive criticism of others. as part of your job, you must listen to opposing viewpoints to make important decisions. in this activity, you are a consulting dam engineer. you must make a decision about four different dams; should they be repaired, taken down, or left alone? you will listen to contrasting opinions about what should be done with the dams before you make the final decision. as the consulting dam engineer, what do you decide to do with this dam? explain your reasoning. by making your decision, did you support the opinions of the mayor and/or the dam safety official? why or why not? (site 1)

Plzz on what physical process is responsible for the creation of volcanoes, earthquakes and ocean trenches at the plate margins?