7th Grade Science Weathering, Erosion and Deposition
Terms in this set (9)
mechanical or chemical surface processes that breaks rocks into smaller and smaller pieces
when chemical reactions dissolve the minerals in rock or change them into different minerals
when rocks are broken apart by physical processes such as wind,water, plant roots, burrowing animals, ice wedging
when surface materials are worn away and carried from one place to another
Explain the main causes of erosion
Glaciers- large masses of ice moving across the land carry rocks and dirt away.
Wind-moving air picks up small pieces of sediment and moves it to another place; dry soil is more susceptible to wind erosion; plants help reduce wind erosion by anchoring the soil; farmers use lines of trees along their farms as windbreaks.
Gravity-the force of gravity can cause rock slides, mud slides and avalanches.
Water-moving water picks up small pieces of sediment and moves it to another place;farmers use no-till farming, terracing and contour farming to help reduce water erosion; rivers are major causes of erosion
List the main causes of erosion
Glaciers,Wind,Gravity and Water
is the dropping of sediment that occurs when the moving agent loses its energy and can no longer carry the sediment. Larger pieces of sediment are dropped first and smaller pieces are dropped as the agents slow more and more
How are caves formed
Caves are formed by rainwater (runoff), dissolving limestone in the ground. (Chemical weathering)
How are deltas formed
Deltas are formed where rivers empty into a lake or ocean as a result of deposition after weathering and erosion have taken place
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