Erotion is the movment of rock mineral grains from one place to another. Sedement comes from larger rocks that have broken down or worn away through weathering. Rocks can be weathering mechanically, chemicaly, or biologically.
Mechanical Weathering
Mechanical weathering is the physical break-up or disintegration of rocks. For example, gravity causes rocks to fall down a cliff and break apart. Rocks rolling down a slop or in a fast-moving stream rub and bump against each other, becoming smoother and more rounded.
Chemical and Biological Weathering
Chemical reactions can spreed up the prosses of erosion. Chemical weathering breaks down minerals through chemical reactios. Rocks react with water, with other chemicals dissolved in water, or with gases in the air. An example of chemical weathering is acid rain, which contains dissolved chemicals from air pollution. acid rainwater reacts with some rocks, such as limestone and dolomite. the rock material dissolves easily in the acid water and washes away.
Biological weathering is the physical or chemical breakbown of rock caused by living organisms, such as plants, animals, bacteria, and fungi. Physical breakdown occurs, for example, when a plant root wedges into a rock by forcing its way into a crack. As the root grows and expands, so does the crack, and the rock is pushed apart until it eventually crumbles and breaks.
Biological weathering is the physical or chemical breakbown of rock caused by living organisms, such as plants, animals, bacteria, and fungi. Physical breakdown occurs, for example, when a plant root wedges into a rock by forcing its way into a crack. As the root grows and expands, so does the crack, and the rock is pushed apart until it eventually crumbles and breaks.
WATER IN MOTION
water in motion is the most powerfull causes of erosion. Sudden changes can occar whenwhen rivers erode their banks and fast moving flood waters cary lardge amounts of soil. oceans and large bodys of water erode their shorlines.
water in motion is the most powerfull causes of erosion. Sudden changes can occar whenwhen rivers erode their banks and fast moving flood waters cary lardge amounts of soil. oceans and large bodys of water erode their shorlines.
got info from texbook.