Answer the

• Continental shelf

A shallow and gently sloping platform extending out from the adjoining continental land mass into the sea.

• Continental slope

A steep slope which descends from the edge of the continental shelf to the deep ocean-bed.

• Continental rise

A gently sloping layer of sediments at the base of the continental slope that merges into the deep-sea floor.

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Deep sea plain or Abyssal plain

Underwater plains found on the deep ocean floor.

• Oceanic deep

Deep trenches found at the deep-sea floors that forms the deepest part of the ocean.

• Oceanic ridge

A continuous submarine mountain chain that are formed when two tectonic plates move apart.