A deep valley with steep sides often with a river or stream running through it.

• A. Valley
• B. Canyon
• C. Plateau
• D. Waterfall

Answer: (B)

Think about how moving water wears away rock over time. A canyon matches this description because it’s a very deep valley with steep sides, and a river or stream often runs through it. The river cuts down into the rock, carving tall, sheer walls as it flows, which is why the sides are so steep. A valley is usually a broader, gentler dip between hills, not the dramatic, cliff-like walls of a canyon. A plateau is a high, flat area with steep drops at the edges, not a deep valley. A waterfall is a drop in a river, not a long carved valley with steep sides.