"Erosion of Land by Rainwater" Earth's Surface and Its Changes PPT Courseware 2

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"Erosion of Land by Rainwater" Earth's Surface and Its Changes PPT Courseware 2

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1. Soil is a mixture of sand, pebbles, clay, humus, water and air.

2. Soil particles can be classified according to their particle size. From large to small they are gravel, sand powder, sand and clay.

3. Put the soil into the water and find bubbles emerging, indicating that there is air in the soil. The soil also contains humus and salts needed for plant growth.

Rain weathers our rocks, so when it rains and falls on the land, what effect does it have on the land?

The force of falling raindrops can break up and splash soil particles. When rainwater flows on the ground, it carries away these particles, and part of the soil is taken away. This is erosion.

Factors affecting erosion (1)

Research Project: Effect of Land Slope on Erosion

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

Experimental method: comparative experiment

Conditions to change: Slope size

Unchanged conditions: vegetation, rainfall, soil structure

Factors affecting erosion (2)

Research project: Effects of vegetation on erosion

Presumption: The worse the vegetation, the more serious the erosion; the better the vegetation, the smaller the erosion.

Experimental method: comparative experiment

Conditions to be modified: Vegetation on the land surface

Constant conditions: land slope, rainfall, soil structure

1. During heavy rain, the water in the river is very turbid. This is because there is a lot of ( ) in the rain.

A. Stones B. Silt C. Small fish

2. We can often see ravines on the ground surface, which are caused by ( ).

A. Animals B. Wind blowing C. The flow of rain

3. The area below that is most seriously eroded by rainwater is (B).

A. North China Plain B. Loess Plateau C. Tropical rain forest

4. The most easily washed away by rainwater is (C) in the soil.

A. Gravel B. Sand C. Clay

5. Factors that can affect soil erosion include (A, B).

A. Slope size B. Presence of vegetation C. Lightning

1. When raindrops fall to the ground, soil erosion begins. ( )

2. In the same area, the size of the soil slope will not affect the degree of erosion. ( )

3. In forests covered with plants, soil erosion is minimal. ( )

4. The greater the rainfall, the greater the erosion of the soil. ( )

5. The falling rain collects and flows together on the ground called runoff. (√)

6. Debris flow is a phenomenon in which soil is eroded by rainwater. (√)

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For more information about the PPT courseware "Earth's Surface and Its Changes and Rainwater's Erosion of Land", please click the Earth's Surface and Its Changes ppt Rainwater's Erosion of Land ppt tag.

"Erosion of Land by Rainwater" PPT download of the earth's surface and its changes:

"Erosion of Rain on Land" The Earth's Surface and its Changes PPT Download Part One Content: Exploration Activity Experiment Name How Rain Affects the Land Experiment Guessing Rainwater Will Change the Terrain Experiment Method Simulate Rain and Observe the Effect of Rain on Land Experiment Materials Soil and water. .

"Erosion of Land by Rainwater" Earth's surface and its changes PPT:

"Rainwater Erosion on Land" The Earth's Surface and Its Changes PPT Part One Content: How Rain Affects the Land Use soil mixed with a small amount of sand and stones to pile up a slope terrain in a rectangular plastic box, pat it tightly with a small shovel, and then place it on the soil Create a vertical cliff on the edge..

"Erosion of Land by Rainwater" Earth's Surface and Its Changes PPT Courseware 3:

"The Erosion of Land by Rainwater" The Earth's Surface and Its Changes PPT Courseware 3 The Movement of the Earth The Generation of Rainwater. The circulation of water in nature. There are extensive connections between things in nature and they are in eternal motion. Dangers of rainwater. Learn to think about nature...

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Update Time: 2024-09-26

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

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