Glaucoma is a group of eye diseases which result in damage to the optic nerve and vision loss. A major risk factor is increased pressure in the eye. The disorders can be roughly divided into two main categories:  open-angle  and  closed-angle  (or  angle closure ) glaucoma.laucoma is a group of eye diseases which result in damage to the optic nerve and vision loss. A major risk factor is increased pressure in the eye. The disorders can be roughly divided into two main categories:  open-angle  and  closed-angle  (or  angle closure ) glaucoma.
Q: A geochemical cycle that cycles material by mantle convection, subduction, and seafloor spreading is A: A geochemical cycle that cycles material by mantle convection, subduction, and seafloor spreading is TECTONIC. Weegy: erosion. The rock cycle includes the formation, breakdown, and reformation of a rock as a result of sedimentary, igneous, and metamorphic processes.
Mantle convection is the most widely studied method of tectonic plate movement and it is very similar to the theory developed by Holmes in 1929. There are large convection currents of molten material in the Earth's upper mantle.cientists today have a better understanding of the make-up of the tectonic plates, the driving forces of their movement, and the ways in which they interact with one another. A tectonic plate itself is defined as a rigid segment of the Earth's lithosphere that moves separately from those surrounding it.