Consider the following forces which can lead to Land Subsidence in any particular area in the Seismically active Himalayan Region:
1. Punctured Underground Aquifer
2. Reduction in Shear Strength of Debris
3. Displacement of Underground material
4. Increase in Green Cover
Which of the above statements are correct?
1
1, 2 and 3 only
2
2, 3 and 4 only
3
1 and 3 only
4
1, 2, 3 and 4