Particles may be classified in size by relative settling rates. Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles. Soil erosion is a two-phase process consisting of the detachment of individual soil particles from the soil mass and their transport by erosive agents such as running water, wind or mechanical impact (e.g. Process Basics []. Based on which they are classified as shown in below table. It's clear that soil water is a critical resource needed for plant growth. Settling also refers to movement of structures located above deep beds of soft clay. The size of the eroded particles depends on the velocity of the water. Figure 10.11 is a diagram that illustrates the components of the soil-water balance. Moving water also picks up and carries particles of soil and rock. Dissolved compounds can also leach into ground water supplies. When sufficient energy is no longer available to transport the particles, a third phase, deposition, occurs (Morgan, 2005). tillage). The risks of any of these events occurring are highly dependent on soil texture. Soil and dust particles are often colonized by fungal hyphae (white filaments in image); spores and bacteria are also found on dust particles. A soil's mineral particles have been formed in place from the bedrock below Transported Soil The mineral particles have been carried from some other location by wind, water, gravity, or ice How much infiltrates depends greatly on a number of factors. Settling, in soil mechanics, refers to sedimentation; i.e., the settling out of solid particles from suspension in water. As water slows, larger particles are deposited. The ability to erode is affected by the velocity, or speed, of the water. Transported Soils: As the name say, these are soils that are transported from the area of weathering to some other location by means of transportation agents like wind, water, ice or gravity. The size of residual soil is indefinite. Contaminants move into surface water bodies attached to eroding sediment or dissolved in runoff water. Erosion control practices are typically designed to prevent detachment and transportation of soil particles while sediment control is designed to trap eroding soil on-site. The velocity of settling depends on the size, shape, and density of the particles, and on the viscosity of the water. Anywhere in the world, a portion of the water that falls as rain and snow infiltrates into the subsurface soil and rock. Because soil takes so long to form, human activities that damage soils have long-term consequences for ecosystems, and for the utility of the soil for food production. SOIL-WATER BALANCE. Eventually, the water deposits the materials. 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