Question

which term is described as a flat expanse of ocean floor?
continental shelf
deep - sea trenches
abyssal plains
guyots

Explanation:

• Continental shelf: It is the gently sloping submerged portion of the continental margin, not a flat expanse of the deep - ocean floor.
• Deep - sea trenches: These are long, narrow depressions in the ocean floor, not flat.
• Abyssal plains: These are flat, deep (usually 3000 - 6000 m) areas of the ocean floor covered with fine - grained sediments like clay and silt.
• Guyots: These are flat - topped seamounts (underwater mountains), not large flat expanses of the ocean floor.

Answer:

abyssal plains