1. occurs when denser ocean crusts slide beneath lighter continental crusts
2. causes the formation of deep ocean trenches
3. is responsible for high occurrences of volcanoes and earthquakes in some areas
4. helps in mountain formation
Which among the above statements is / are correct?

Answer: [D] 1, 2, 3 & 4

This question is a part of GKToday's Integrated IAS General Studies Module