7-8 layers
The concentric layers are the sclera,conjunctiva,and the cornea
The layers of the eye include the cornea, the sclera, the choroid, the retina, and the optic nerve. Each layer has a specific function in the process of vision.
The four layers of the rain forest are (top to bottom:Emergent LayerCanopyUnderstoryForest Floor
There are four layers in a rain forest
cornea, lens, aqueous humor, vitreous humor
The cornea becomes cloudy when water leaks through the epithelial or endothelial cell layers. This can be caused by a corneal ulcer or deep scratch on the outer surface, or by glaucoma or infection within the eye. If the damage is to the outer layers of the cornea, removing the cause of the defect and allowing the cornea to heal will result in the cloudiness going away. If the damage is to the inside layer (the endothelium), you will probably need a corneal transplant to allow you to see again.
Cornea transplant
The variable that is used to separate the atmosphere into four layers is temperature. The four layers are the troposphere, stratosphere, mesosphere, and thermosphere, and each layer is defined by changes in temperature with altitude.
welll it is the lower cornea
mantle
Four