The correct answer is - b. destructive.
Once the mountains stop their lifting up and also the other features are done with their formation, the erosion process takes over and starts to do its work by slowly wearing down the mountains and other features. The tendency of the erosion process is to flatten everything that it affects, so if there isn't any significant change that will cause lifting up of the terrain, the erosion will be able to flatten the space as much as possible. The erosive processes are considered as destructive processes because they are destroying the land features.
Thats correct because all the other places have a bigger population
circle of latitude are unlike circle of longitude which are all great circle with the centre of the earth in the middle as the circle of latitude get get the smaller as the distance from the equator increase the 60th parallel parallel North or South is half as long as the equator so the latitude of a circle but longitude are only half circle
