After studying the maps that you posted with the question, the map that shows both the dominate air pressure over India can be found easily. So the air pressure system that forms in the summer and the direction of the surface winds around the air pressure system can be found in map number 1.
I believe the answer is C) sand, gravel, and silt particles
For the answer, the question above, the similarities of both mountains and plains is that it can support any life forms like trees and animals Both types of land have a source of water which is essential for living things. For water comes from mountains and pours down to the plains.
For mountain is once a plain.