Weathering and Erosion5

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Weathering and Erosion:

Weathering and Erosion By: Isabel Quinones Becky Ramey Nolan Whitney


Weathering Weathering is the breaking down of rocks, soils, and minerals. DO NOT confuse this with erosion.


Erosion Erosion is the process in which soil and rock are removed from Earth’s surface by processes such as wind and water flow.

Types of Weathering:

Types of Weathering There are three types of weathering such as Physical, Chemical, and Mechanical weathering. Physical Chemical Mechanical

Causes of Weathering and Erosion:

Causes of Weathering and Erosion Weathering- rocks break down into smaller pieces. Just breaks down rocks; does not move them. Erosion- process which soil and rock are removed from the Earth’s surface by natural processes. (ex. Wind, water flow, ice)

Factors Controlling the Rate of Erosion:

Factors Controlling the Rate of Erosion Porosity of the soil- void spaces where water can collect. Induration of the soil- how hard the soil is. Density of ground cover- modifies the impact of rain drops. Slope degree- how steep hills are. Length of a slope- this causes an increase of speed of running water.

Controlling Erosion Cont.:

Controlling Erosion Cont. Velocity of running water- water’s ability to move soil rapidly moves with speed of flow increases. The degree of saturation of soil- the more saturated the soil the more soil grains are moved.

USGS- The Difference Between Weathering and Erosion:

USGS- The Difference Between Weathering and Erosion Weathering involves two processes that often work in concert to decompose rocks. Both processes occur in place. There is no movement involved. As soon as a rock particle moves we call it erosion.

Soil Erosion:

Soil Erosion Soil erosion by water, wind, and tillage effects both agriculture as well as the natural environment. Soil loss is one of the most important yet probably the least well known of today's problems.

Historical Hopi Buttes Area:

Historical Hopi Buttes Area The erosion exposure of the deposits varies with those in the Eastern portion exhibiting, the shallow eroded maar. The deposits in the Western portion is more deeply eroded.

Erosion in the Southwest:

Erosion in the Southwest Erosion is carving into Southwest Washington beaches. Erosion rates at Cape Shoalwater have averaged over 100 feet per year for a century. In recent decades, new erosion spots have developed. Storm waves near Grays Harbor threatened the city of Westport.

Coastal Erosion Prevention:

Coastal Erosion Prevention The concern for uncontrolled erosion, and the economic dynamic of the coast is the sand dune.

Wind Erosion Prevention:

Wind Erosion Prevention Wind erosion happens when soil is not protected from strong winds. There is a loss of top soil. City and country people should be concerned with this erosion problem. Minimizing tillage practices or working the ground less will prevent wind erosion.

Beach Erosion:

Beach Erosion On a beach, there are fragile dune grasses. Fragile dune grasses help hold the beach together.

Geologic Hazards:

Geologic Hazards Reduce the hazards by improving our understanding of ground failure.

FEMA Landslides and Mudflows:

FEMA Landslides and Mudflows Landslides are a mass of moving rocks debris and a lot of soil. Mudflows are landslides that occur when rocks that are loose, soil, and water are mixed . Landslides Mudflows

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