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.
Vertical convection does not occur in the stratosphere because in this layer of the atmosphere the gases move only horizontally; consequently, the main modes of heat transfer in the stratosphere are radiation and conduction; however there is horizontal convection in the stratosphere known like advection, which is a horizontal heat transfer due to the horizontal displacement of air masses.