Answer:
llithosphere hydrosphere stratosphere
I think i would chose d, although the others aren't bad either :/ i would say d because of their involvement in the war
Planting grass and trees would stop erosion.
The Mosul Dam is located in Iraq- this is the correct answer.
It was built 30 years ago and currently it is causing fears of it breaking; it's located on gympsium, which is prone to erosion.
The Mosul Dam is currently in the hands of the Iraqi government but it was shortly occupied by ISIS to.
The Appalachian Mountains are older than the Rocky Mountains and therefore have had more time to weather and get worn down. The Rocky Mountains are still considered to be relatively young and haven't weathered as much.