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Science Class 4th Grade » Unit 4: Erosion
Unit 4: Erosion Unit 4: Erosion

Unit 4: Erosion

In our fourth unit we will learn about how weathered materials are carried away by wind and water.  We will also learn about why the Earth's crust is constantly changing due to erosion.

Erosion is the gradual wearing away of soil and rock.  Water and wind are the main forces of erosion.

Additional Vocabulary to Know

Acid Rain

Rain that is polluted by wastes that got into the air from burned fuels.

 

Chemical Weathering

Process that breaks down rocks by changing their chemical composition

Continental Glacier

Sheet of ice that covers a large area of land.

Convection

The transfer of heat by currents through a liquid or gas.

Core

The center of the planet.

Crust

The hard outer covering of the Earth.

Deposition

Dropping of sediment by water, wind, or ice.

Earthquake

A shaking movement of the ground caused by a sudden shift of the Earth’s crust.

Fertile

Able to produce fruit, seeds, or young.

Flood

A large amount of water that covers land that is usually dry.

Floodplain

Flat area beside a river that is covered with water when a river floods.

Glacial Till

A mixture of rocks left behind by a melting glacier.

Gravity

The natural force that pulls objects toward each other.

Groundwater

Fresh water stored in cracks and holes in underground rocks.

Humus

Rich, dark material in the soil made of decayed plants and animals.

Landforms

A natural shape or feature of the Earth’s surface.

Mantle

The thickest layer of Earth, made of molten rock under pressure.

Mass Movement

Downhill movement of large amounts of earths materials, such as rocks and soil, caused by gravity.

Mineral

A solid substance formed in nature that has never been alive.

Physical Weathering

Mechanical breakdown of rocks into smaller pieces by natural processes.

Plates

One of the very large sheets of rock that make up the Earth’s crust.

Rock

The hard matter made of minerals that forms the Earth’s crust.

Runoff

Water that flows over Earth’s surface but does not evoraporate or soak into the ground.

Sea-floor Spreading

Process by which new oceanic crust is created by plates moving apart.

Sediment

Particles that settle in a liquid.

Sinkhole

Hole on Earth’s surface formed when the rock below has been dissolved by groundwater.

Soil

The layer of loose material covering Earth’s land surface.

Soil Horizon

Soil layer.

Soil Profile

A vertical section of soil from surface down to bedrock.

Weathering

The breaking down of rocks into smaller pieces.

Watch the Videos Below To Learn More About Weathering and Erosion

Videos Were Created by the South Florida Science Museum

 

 

 

 










Mrs. Travis' Classroom
Dorchester County Public Schools
Choptank Elementary
1103 Maces Lane
Cambridge, Maryland 21613