This is the laying down of sediments by water, wind, glaciers or gravity.
What is deposition.
100
This slow type of erosion by gravity pulls soil downhill causing trees to lean.
What is creep.
100
This is the layer of soil that contains slightly weathered bedrock.
What is horizon C.
100
In this kind of weathering, rocks break down due to chemical reactions and changes.
What is chemical weathering.
100
This type of mechanical weathering is caused when the outside of a rock is weathered and eroded and the inside expands quickly causing the rock to crack.
What is release of pressure.
200
This is the movement of rock and sediment by glaciers.
What is plucking.
200
This overland flow of water causes erosion especially when there is a lot of rain all at once.
What is runoff.
200
This was a period of erosion by wind in the U.S. Midwest in the 1930's which caused a lot of farm families to have to move.
What was the Dust Bowl.
200
This type of chemical weathering is caused by air pollution from the burning of fossil fuels like coal.
What is acid rain.
200
This is another name for mechanical weathering by freezing and thawing.
What is ice wedging.
300
This is the movement of sediment by wind.
What is deflation.
300
New rivers on steep slopes cause these to form as the rocks on the bottom of the river bed are weathered and eroded at different rates or speeds due to the minerals that make them up.
What are rapids and waterfalls.
300
These agents of erosion cause weathering by abrasion.
What are water, gravity, glaciers and wind.
300
This is the decayed organic matter (once living things) in horizon A.
What is humus.
300
In the process of soil formation this starts to happen as soon as bedrock is exposed.
What is weathering of rock.
400
These three process work together to constantly change Earth's surface.
What are weathering, erosion, and deposition.
400
Old rivers on gradual slopes have these formations due to erosion of the outer banks by fast flowing water and deposition on inner banks where water flows more slowly.
What are meanders.
400
This is a simple way to prevent soil erosion.
What is planting trees and other plants.
400
These are the other two names for horizon B (part of the soil that contains clay and other tiny particles).
What subsoil and mineral soil.
400
This is the type of mechanical weathering that occurs when rocks rub against other rocks.
What is abrasion.
500
Erosion by this causes mass movement of rock and sediment.
What is gravity.
500
Plant roots cause this type of weathering.
What is mechanical and chemical. (Mechanical as they grow bigger in size in the crack of a rock and chemical when they release acids that cause the rock to chemically change.)
500
Valley glaciers in mountains form under these conditions.
What is when more snow falls than melts.
500
This is the order in which the soil horizons form.
What is C, A, B.
500
Beaches are sandy because of these three processes.