This presentation will tell us about How Different types of Weathering and Erosion have a impact on Human Activities and How they Also effect the environment.

1. Made By : Hamna Ahmed
VIII-B
Beacon house School System
References: International Lower
secondary Geography
Yahoo Answers
Google.com.pk
Submitted Date: 5/2/15
( All references are used for
Educational purposes only )

2. Impacts of Weathering and Erosion On Human
Activities

3. Weathering
• Weathering actually refers to the general
process whereby rocks disintegrate and
decompose at or near the Earths surface ( in
situ) .

4. Types of Weathering
• There are three types of weathering.
• Physical weathering
• Chemical weathering
• Biological weathering

5. • 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

6. 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.

7. 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.

8. Weathering

9. Erosion

10. Impacts of Weathering and
Erosion On Human
Activities
• The impacts of weathering and erosion on
humans can be categorized into positive and
negative impacts.

11. 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.

12. 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.

13. Positive Impacts of Weathering
and Erosion On Human Activities

14. Negative Impacts of Weathering
and Erosion On Human Activities

15. 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.

16. 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: dirt
C: 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