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

SOIL EROSION

SOIL EROSION

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

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

CAUSES OF MECHANICAL WEATHERING

WATER WIND PEOPLE

BURROWING ANIMALS

BIG ROOTS OF PLANTS

AGENTS OF SOIL EROSION

RUNNING WATER

WIND

GRAVITY

ANIMALS

HUMANS