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Such structure could be called a Canyon.
The submarne canyon is very steep-sidded.
A canyon or chasm
A 'hanging valley' is a valley which is cut across by a river flowing in a deeper valley.
A long, narrow valley between high cliffs is a canyon. Canyons within mountains, or gorges that have an opening on only one side are called box canyons. Slot canyons are very narrow canyons, often with smooth walls.
I have heard it called the rim.
Basins and canyons are both valleys. A basin is a wide valley shaped like a bowl and a canyon is a very narrow valley with steep sides.
the low area between hills or mountain is called...VALLEY
That was a very steep hill!
A long narrow and very deep canyon where the ocean floor bends down toward the mantle is called an ocean trench. This is caused by two plates pulling apart.
It depends how steep the hill is if it isn't very steep then they should b fine but I wouldn't recommend it if the hill is very steep
A long narrow and very deep canyon where the ocean floor bends down toward the mantle is called an ocean trench. This is caused by two plates pulling apart.