Science P5_Ch.8_Lesson2_Soil Erosion

Ch. 8 Shaping Earth's Surface
Lesson 2. Soil Erosion

By Inggrid Lombogia

In this lesson, you will study the different factors that move rock fragments and soil from one place to another.

Soil Erosion

Multiple Choice

How does soil erosion affect living things?

• It helps plants grow better.

• It destroys habitats and harms animals.

• It has no effect on people or nature.

• It makes the soil healthier.

Happens when the broken pieces of weathered rocks move from the site where weathering has occured.
Erosion (Latin: ERODERE) means "eating away"

What is Erosion?

Multiple Choice

Look at the picture. What causes a basalt cliff to form?

• Acid rain

• Frost wedging

• Biological Weathering

• Chemical Weathering

Agents of Soil Erosion

When the wind blows, it can lift and move bits of rocks and soil. Deflation can lower the land by several feet.

Water

Is a force that pulls an object toward Earth.

Gravity

Wind

Rivers and streams move pieces of rock.

Gradual movement of soil on a slope. (WINTER)

Creep

Occurs when moist soil moves downhill on the surface of the ground. (Mixture: rocks, soil, and water = mud)

Mudflow

Happens when rock break free from the side of a cliff or mountain.

Rock Slide

Commonly occurs when the ground becomes soaked in water due to heavy and prolonged rains.

Slump

When gravity alone causes rocks and soil to move downward, the erosion is called Mass movement.

4 Mass Movement Types | quizPurposeGamesPurposeGamesPurposeGames

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Multiple Choice

The name of the mass movement on the following picture is ...

• Slump

• Mudflow

• Rock slide

• Creep

Aeolian erosion (Aelous, the greek god of winds)

Is a form of erosion that makes rocks appear smoot and pl

Abrasion

Wind.
When the wind blows, it can lift and move bits of rocks and soil.
Deflation can lower the land by several feet.

Multiple Choice

It caused by...

• Wind

• Water

• Gravity

• Rocks

Water. Rivers and streams move pieces of rock. Fast-flowing rivers can move large rocks, while slow-flowing rivers can only move tiny pieces of rock.

Canyon

Valley

​​What are the effects of erosion?
When all agents of erosion works, it causes changes in the shape of Earth's surfaces. When they are removed, canyon and valleys are formed.

Categorize

Options (6)

Creep

Mudflow

Slump

Deflation

Abrasion

Erosion

Organize these options into the right categories

Gravity

Wind

Water

Dropdown

What are the effects of Erosion?​

Select answer

​

Select answer

One of the method of soil conservation that leaves the previous year's crop residue, such as corn stalks or rice straw, on fields before and after planting the next crop to reduce soil erosion and runoff

Conservation Tillage

Are large sheets of woven fibers. Can be made of nonbiodegradable material like plastic, or biodegradable material like coconut fiber. Prevent soil from sliding down as water flows over it.

Erosion Mats

​​How can we prevent soil erosion?

Areas of permanent vegetation. They slow water speed, filter pollutants, and trap sediments. Prevent soil from moving.

Buffers and Filter strips

Artificial water channels that control the flow of water. Guide the water flow. They slowly release water into an area to reduce the impact of the flow of water

Flumes

​​How can we prevent soil erosion?

Balances the number of animals with the grazing area and the available plant cover.

Pasture Management

Agricultural method where ridges and channels are bult across a slope to stop water flow and reduce soil erosion.

Terracing

​​How can we prevent soil erosion?

Multiple Choice

How can we prevent soil erosion? (According to the picture)

• Flumes

• Buffers and filter strips

• Pasture Management

• Terracing

Summary

• Erosion = happens when the broken pieces of weathered rocks move from the site where weathering has occured.

• Mass Movement has 4 types:

  1. creep

  2. Mudflow

  3. Rock slide

  4. Slump

• Deflation is the erosion of land caused by wind.

• Abrasion is a form of erosion that makes rocks appear smooth and polished.

Thank you
Classwork: Pg. 244 - 245