Weathering
Soil
Movements in Soil
Changes Over Time
More Slow Changes Over Tim
100
The breaking down of rocks into small pieces
What is weathering
100
Rotted plants and animal material
What is humus
100
The process by which pieces of rock are carried away by wind or by moving water
What is erosion
100
The natural features of Earth's surface, like mountains, hils, rivers, beaches, or deserts
What is landforms
100
Hills built from sand that is carried and dropped off by wind
What is sand dunes
200
Breaking down rocks by freezing and melting, plant roots, or wind
What is physical weathering
200
Layers of soil that are different from each other
What is horizons
200
The process by which pieces of rock are dropped off by moving water or wind when it slows down
What is deposition
200
Wide, flat stretches of land without any hills or mountains
What is plains
200
Large, thick sheets of ice that can move slowly across land by flowing downhill
What is glaciers
300
The process of chemicals in the air, water, or land breaking down rocks
What is chemical weathering
300
Rock that has not been broken down
What is bedrock
300
This substance causes erosion by breaking rocks apart in small pieces or sand
What is moving water
300
A deep narrow landform with steep sides
What is a canyon
300
Long, narrow strips of land built up from sand that was dropped along a shore. These landforms run along coasts.
What is barrier islands
400
Chemicals that gradually eat away at rocks
What is acid(s)
400
Topsoil that is rich in humus
What is "A Horizon"
400
Farmers can slow this process by planting trees to block wind, planting crops in strips, and plowing across slopes rather than down a slope.
What is erosion
400
An area of low land between mountains
What is a valley
400
This landform is formed as glaciers melt over time, and move downhill, leaving a wide, deep shape.
What is valleys
500
The process by which oxygen and water react with the mineral iron
What is rusting
500
Soil that has little humus and few plant roots, as well as broken pieces of rock
What is "B Horizon"
500
During the 1930s, this was a dry, bare area where clouds of sand and dust blew everywhere. It was caused by erosion from overuse of the soil.
What is the Dust Bowl
500
An area of land at the mouth of a river
What is a delta
500
Three things that change the land by picking up and moving particles of rock or sand. Over time, these three things can weather rocks and wear down rocky cliffs, create canyons and sand dunes, and create U-shaped valleys with a wide, deep shape
What is water, wind, and ice
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