Structure formed by the crossing over of the optic nerves

Optic chiasma

Explanation:

Optic chiasma is  the part of the brain where the optic nerves partially cross.

For example, the optic nerve fibres on the nasal sides of each retina cross over to the opposite side of the brain at the site of optic chiasm. The same thing is with the opposite site. Since the fibres intersect at the chiasm, it has the hallmark X-shape.

surface mining destroys mountain tops, landscapes, forests and wildlife habitats. on top of that, it leads to soil erosion and destruction of agricultural land. the landscape changes can also disrupt river channels and streams, which leads to flooding. which, can destroy plant life and other animals as well.

explanation:

a and c are the answeres