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.
Composition. Soil is composed of three types of particles: sand, silt and clay. Sand makes up most of soil, and does not have terrific water holding capabilities. The clay particles in soil are very small and do no allow much water to drain.Silt is the second largest component of soil with characteristics of both sand and clay.ypes. There are three types of loamy soil; each is determined by its composition. Light loamy soil consists of more sand than clay or silt. Medium loamy soil is the most sought after because it contains equal amounts of each component.