A fold surface seen parallel to its shortening can be divided mainly into
hinge and limb portions, the limbs are the flanks of the fold and the hinge zone is where the flanks join together. In this last portion lies the hinge point which is the point of minimum radius of curvature (maximum curvature) for a fold. The description parallel to shortening direction is completed by the crest of the fold which represents the highest point of the fold surface whereas the trough is the lowest point. The inflection point of a fold is the point on a limb at which the concavity reverses; on regular folds, this is the midpoint of the limb
Explanation:Destruction of natural vegetation is primarily caused by deforestation. Other major causes are wildfire and over-exploitation. Deforestation not only occurs as a result of firewood extraction by the local population but also as a result of the creation of arable as well as pastoral land.
