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
1 and 2 only
2
3 and 4 only
3
1, 2 and 4 only
4
1, 2 and 3 only