"The Effect of Rivers on Land" Earth's Surface and Its Changes PPT Courseware 3

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"The Effect of Rivers on Land" Earth's Surface and Its Changes PPT Courseware 3

Review before class

1. The degree of land erosion is related to factors such as ________, ________, and ________.

2. When conducting experiments on the size of the slope and the degree of erosion, the conditions that need to be changed are ________, and the conditions that cannot be changed are ________, ________, ________ and other conditions.

Research on factors affecting erosion

Research Project: Effect of Land Slope on Erosion

Presumption: The steeper the slope of the land, the more serious the erosion, and the smaller the slope, the better the erosion.

Experimental method: Comparative experiment Conditions to be changed: Land slope

Constant conditions: vegetation, rainfall, soil structure

Experimental phenomenon: Land with steep slopes has more serious water and soil flow conditions than land with smaller slopes.

Experimental results: The slope of the land affects erosion. The steeper the slope, the more serious the erosion.

Recall the sedimentation experiment we did earlier. When the water is stirred with chopsticks, what will happen to the soil in the water?

Will flow with the water flow.

When the stirring stops, what happens to the water that was originally moving and the soil it carried?

As the water stops flowing, the soil will slowly settle.

What does the deposited soil look like?

The largest particles are deposited at the bottom and the smallest particles are deposited at the top.

The role of rivers in land

1. After the river flows out of the valley, the slope gradually becomes smaller and the water flow rate also decreases ( ).

A. Faster B. Slower C. No change

2. On the river bed upstream, we can see a lot of ( ).

A. Big rocks B. Pebbles C. Fine sand

3. The water flows quickly and its ability to carry sediment is ( ).

A. Strong B. Weak C. Unable to judge

4. The plains in the middle and lower reaches of the Yangtze River are formed due to ( ).

A. Soil loss B. Soil deposition C. Seawater erosion

5. Most of the plains in our country are formed by ( ).

A. Human landfill B. River transportation C. Seawater erosion

6. Rivers have ( ) effect on the land

A. Erosion B. Deposition C. Erosion and deposition

1. The river bed in the lower reaches of the river is filled with fine sand. ( )

2. The water surface of the Yellow River is higher than the surface of the earth and it is a famous above-ground river. ( )

3. The wider the river bed and the faster the water flow, the stronger the ability to carry sediment. ( )

4. The river water has a strong transport capacity and can move sand and gravel from the upper reaches to the lower reaches ( )

5. Most of our country’s plains are located in the lower reaches of rivers. ( )

6. Wind, glaciers, waves, etc. also have erosion and sedimentation effects on the land. ( )

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"The Effect of Rivers on Land" Earth's surface and its changes PPT download:

"The Effect of Rivers on Land" The Earth's Surface and Its Changes PPT Download Part One: Exploration and Discovery Rivers are the collective name for larger natural water flows on the earth's surface. They are formed by runoff generated by melting ice and snow or rainfall. What rivers do to land Explore rivers..

"The Effect of Rivers on Land" Earth's surface and its changes PPT:

"The Effect of Rivers on Land" The Earth's Surface and Its Changes PPT Part One: Exploring the Effect of Rivers on Land Will rivers erode the land on both sides? If a river flows from rugged mountainous terrain to a gentle place, what happens to the sediment carried by the river? ..

"The Effect of Rivers on Land" Earth's Surface and Its Changes PPT Courseware 4:

"The Effect of Rivers on the Land" The Earth's Surface and Its Changes PPT Courseware 4 Explore the Effect of Rivers on the Land There are many streams and ravines on the surface of the earth. The streams converge into rivers. So what effect do rivers have on the land? Will the river erode the land on both sides? If the river flows from rugged...

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Update Time: 2024-09-27

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

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