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Slow Earth Processes:Weathering, Erosion, and Deposition
Mechanical WeatheringMechanical weathering is the destructive force in which rocks are broken down into smaller pieces of rock, called sediments.
DepositionDeposition is the constructive force in which sediments that have been moved from one place are dropped, or released, in a new location.
ErosionErosion is the destructive process in which sediments are carried away by moving water, wind, or ice.
Chemical WeatheringChemical weathering is the destructive process in which rocks are broken down and changed into other materials.
Agents of erosion: moving water, wind, and moving ice (glaciers)
The Grand Canyon, and other canyons, form from water erosion. The river carries away sediments from its bed as it flows.
Agents of mechanical weathering: wind, water, ice, plant roots, heating and cooling, and burrowing animals.
Agents of deposition: wind, water, and ice
Caves form from chemical weathering. As acidic water seeps underground, it dissolves limestone to form caves.
Deltas from when flowing water in a river slows down as it meets a larger body of water. As the water slows down it deposits the sediment it is carrying.
Agents of chemical weathering: moss, lichen, and acidic water
This arch formed from mechanical weathering. As wind blew sand against the rock, it broke down. Heating and cooling also caused the rock to weather.