Question

which of the following is a region with steep undersea mountains and deep valleys?
ocean basin floor
continental margin
ocean trench
ocean ridge

Explanation:

• Ocean basin floor: It is relatively flat with some abyssal plains and small hills, not characterized by steep mountains and deep valleys.
• Continental margin: Comprises the continental shelf (gentle slope), continental slope (steeper but not with steep mountains and deep valleys like the described region), and continental rise (gradual slope).
• Ocean trench: It is a deep - narrow depression, mainly a deep valley - like feature but not with steep undersea mountains.
• Ocean ridge: It is a continuous mountain range on the ocean floor with steep sides and in some cases, deep valleys (like rift valleys along the mid - ocean ridges).

Answer:

ocean ridge