This is because the mountains are formed by the collision between the tectonic plates.
Explanation:
The mountains are formed by the shock that occurs when the tectonic plates collide with each other. By the force of this shock, the surface of these plates folds, generating a mountain on the Earth's surface.
As these shocks between the tectonic plates have more strength and intensity in the regions of the edges, it is easier that we can see the existence of mountains in the regions that are on the edges of the tectonic plates than in the regions that are in the middle.
At the beginning of the follicular phase, the lining of the uterus (endometrium) is thick with fluids and nutrients designed to nourish an embryo. If no egg has been fertilized, estrogen and progesterone levels are low. As a result, the top layers of the endometrium are shed, and menstrual bleeding occurs.
