Question

The volcanic origin deposits which are formed on the ocean floor at a depth of 3 km to 6 km in the Abyssal Plain region are known as

• A. Calcareous ooze
• B. Pelagiac deposits
• C. Radiolarian ooze
• D. Red clay

Hint:

Deep-sea sediments on the ocean floor are classified by their origin into calcareous oozes, siliceous oozes and inorganic clays.

Answer 1

The Correct Option is D

Step 1: Understand the setting.
We need a deposit of volcanic origin that settles on the deep abyssal plain at about 3 km to 6 km depth.

Step 2: Recall how deep-sea deposits are grouped.
They are mainly biogenic oozes (from organism shells) and inorganic clays.

Step 3: Remove the biogenic oozes.
Calcareous ooze and radiolarian ooze come from tiny marine organisms, and calcareous shells even dissolve before reaching such great depths.

Step 4: Check pelagic deposits.
Pelagic is a broad term for open-sea deposits, not specifically the volcanic clay we want.

Step 5: Identify the volcanic deposit.
Red clay is an inorganic deposit rich in volcanic and wind-blown fine particles, found on the deepest abyssal floor.

Step 6: State the answer.
So the volcanic-origin deep deposit is red clay.
\[ \boxed{\text{Red clay}} \]