Made By : Hamna AhmedVIII-B

Beacon house School System References: International Lower secondary Geography

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Submitted Date: 5/2/15( All references are used for Educational purposes only )

Impacts of Weathering and Erosion On Human Activities

Weathering• Weathering actually refers to the general

process whereby rocks disintegrate and decompose at or near the Earths surface ( in situ) .

Types of Weathering

• There are three types of weathering.• Physical weathering• Chemical weathering• Biological weathering

• Types Of Physical Weathering:• Alternate Expansion and Contraction of Rocks.• Freeze-Thaw Action Of Ice or Frost Shattering.• Release of Pressure within rocks.• Types Of Chemical Weathering:• Oxidation.• Carbonation

Erosion• Erosion is the process by which the surface of

the Earth gets worn down. We can also define Erosion as the removal of weathered materials by natural agents such as flowing water, winds and sea waves.

Agents Of Erosion

• Flowing Water: Where streams and rivers flow across the Earths surface, flowing water causes erosion to take place.

• Winds: Wind erosion is dominant in dry areas such as deserts.

• Sea Waves: Rock Particles and sand carried by waves gradually wear down the rocks to form coastal physical features such as cliffs.

Weathering

Erosion

Impacts of Weathering and Erosion On Human

Activities • The impacts of weathering and erosion on

humans can be categorized into positive and negative impacts.

Positive Impacts

• The weathering of rocks helps to form the basic component of soil. Soil is very essential for Human Activities .It enables farming for food crops.

• Weathered Rock materials are used by people for construction purposes such as the building or homes or the construction of bridges and roads in rural areas.

Negative Impacts • Erosion by flowing water during floods causes

extensive damage to human properties and they also destroy lives. Floods can cause crops and livestock destruction.

• Mildly Acidic rainwater can damage buildings, especially on the limestone commonly used in building construction.

Positive Impacts of Weathering and Erosion On Human Activities

Negative Impacts of Weathering and Erosion On Human Activities

What human activities can increase the rate of weathering?

• Humans can affect weathering (breaking down of rock/soil) in several ways. Humans cause increases in acid rain and pollution, which increase the amount of weathering agents in the air and water, and then on land.

Quiz • Which of the following is the correct definition of "weathering"?• A: The breakdown of rocks.

B: The removal of rocks.C: Neither

• After weathering occurs, what is left over from the rocks that have been broken down?• A: water

B: dirtC: soil

• Are erosion and weathering dependent upon one another ?• A: Yes-they both need to occur for the cycle to continue.

B: No- they are separate events that occur independently.• Which process comes first, erosion or weathering?• A: erosion

B: weathering