The human eye has three layers of eye tissue: the fibrous layer, the vascular layer, and the retina. Each of these layers performs a different function in helping a human see or in eye, as well as forms a place for muscles to attach to. The vascular layer protects portions of the eye. The fibrous layer of eye tissue allows light to enter the ourishes the eye and controls how much light comes into it. The retina is the section of the eye that allows a person to see. The fibrous layer has two distinct parts.
Noun. 1. alluvial soil-a fine-grained fertile soil deposited by water flowing over flood plains or in river beds. alluvial deposit, alluvial sediment, alluvium, alluvion-clay or silt or gravel carried by rushing streams and deposited where the stream slows down.. alluvial soil-a fine-grained fertile soil deposited by water flowing over flood plains or in river beds. alluvial deposit, alluvial sediment, alluvium, alluvion-clay or silt or gravel carried by rushing streams and deposited where the stream slows down.
The texture of soil is determined by the ratio of sand, clay, and silt in soil. Soil with higher sand is sandy loam and feels more grainy because sand grains are larger than than the other rocks grains. Silty loam is produced by a higher percentage of silt in the soil. It is a finer grained soil because silt tends to be smaller than sand. On the soil triangle, these three components are able to make up a wide variety of soil textures. Soil is named for its texture, thus the texture of a soil is very important. Too much or too little of any of these components can make the soil not usable for agriculture.