soil erosion and weathering

7
SCIENCE 4 CLASS SOIL EROSION

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Post on 07-Jul-2015

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this simple powerpoint presentation is about soil erosion and weathering. it also contains some videos which will help in further explanation of the topic

TRANSCRIPT

Page 1: Soil erosion and weathering

S C I E N C E 4 C L A S S

SOIL EROSION

Page 2: Soil erosion and weathering

SOIL EROSION

Page 3: Soil erosion and weathering

TWO SECRET CODES

EROSION

• Is the process of

wearing away of rocks

and soil because of the

action of some agents

such as wind, water,

gravity, animals, and

people.

WEATHERING

• The process of breaking

down rocks.

• Chemical Weathering

• Mechanical Weathering

Page 4: Soil erosion and weathering

SOIL EROSION AND WEATHERING

Page 5: Soil erosion and weathering

TYPES OF WEATHERING

CHEMICAL WEATHERING

• It involves a reaction of substances, such as an acid, to the minerals that make up the rock

• Oxygen in air may also cause chemical weathering when it interacts with iron in soil. Iron oxide or rust is formed.

MECHANICAL WEATHERING

• Occurs when agents

such as animals, plants,

water, wind, and

people break rocks

physically into pieces

Page 6: Soil erosion and weathering

CAUSES OF MECHANICAL WEATHERING

WATER WIND PEOPLE

BURROWING ANIMALS

BIG ROOTS OF PLANTS

Page 7: Soil erosion and weathering

AGENTS OF SOIL EROSION

RUNNING WATER

WIND

GRAVITY

ANIMALS

HUMANS