Consider the following statements:
- 1. Many of the world’s largest mountain chains exist beneath the sea.
- 2. Some mountain chains are revealed as island arcs.
- 3. The mid-oceanic ridges form the longest mountain chains.
- 4. The mid-Atlantic ridge rises thirty-three metres above the floor of the Atlantic.
Which of the statements given above are correct?
1 and 2 only
3 and 4 only
1, 2 and 4 only
1, 2 and 3 only
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC CAPF – 2023
Statement 2: Island arcs are curved chains of volcanic islands that are often formed along convergent plate boundaries where one oceanic plate subducts beneath another. These volcanic islands represent the peaks of underwater mountain ranges that have risen above the sea surface. Thus, some mountain chains are revealed as island arcs. This statement is correct.
Statement 3: The mid-oceanic ridge system is a vast underwater mountain range that stretches for over 65,000 kilometers across the globe’s oceans. It is considered the longest mountain chain on Earth. This statement is correct.
Statement 4: The Mid-Atlantic Ridge is a major part of the mid-oceanic ridge system. While it rises significantly above the surrounding abyssal plains, its rise is typically hundreds or thousands of metres, not just thirty-three metres. Most of the Mid-Atlantic Ridge remains submerged, although it surfaces in Iceland. This statement is incorrect.