"The Impact of Human Activities on the Earth's Surface" Changes in the Earth's Surface PPT Courseware

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"The Impact of Human Activities on the Earth's Surface" Changes in the Earth's Surface PPT Courseware

Human activities are constantly changing the surface morphology.

In how many ways have humans continued to change the surface morphology?

Release large amounts of carbon dioxide, soil erosion...

Therefore, we understand a truth; human activities are a special kind of external force. Because with the rapid development of industry, agriculture, science and technology, the depth and breadth of human activities are increasing day by day. The impact on surface morphology is considerable. For example, in accordance with the laws of nature and social needs, the long-term economic activities of our country's working people have shaped many artificial landforms with very obvious surface morphological characteristics - terraces, mulberry fish ponds, loess silt dams, sea reclamation, etc. Many large cities in the world, such as Mexico, Tokyo, Dayi, Shanghai, etc., have experienced land subsidence due to long-term excessive exploitation of groundwater. By 1965, Shanghai's cumulative subsidence reached 2.6 meters. According to some statistics, by 1965, the earth's continental area was 8% has been covered by various projects, and the area will nearly double in 2000; many new landforms have been created in mineral mining, agricultural production, military activities and other engineering construction. We must rationally utilize and protect the environment.

What deep feelings did you gain when faced with a large number of typical facts? Think independently for 2 minutes, and you can discuss it with your classmates after two minutes.

My feeling: Human activities are a special kind of external force. Because with the rapid development of industry, agriculture, science and technology, the depth and breadth of human activities are increasing day by day. The impact on surface morphology is considerable.

Analyzing the changing trend of Dongting Lake area in the table above, what did you find? What are the consequences of large-scale land reclamation from lakes? What are our plans for this?

I discovered that due to people's continuous destruction, the area and capacity of Dongting Lake have changed less and less.

The reclamation of lakes for farmland first accelerates the process of lake swamping, causing the lake area to continue to shrink, making it difficult to regulate and store surface runoff, leading to frequent droughts and floods.

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"The Impact of Human Activities on the Earth's Surface" Changes in the Earth's Surface PPT Courseware 3:

"The Impact of Human Activities on the Earth's Surface" Changes in the Earth's Surface PPT Courseware 3 What effects have you found of human activities on the Earth's surface? How has the landscape changed? What benefits do urban development and changes bring to us? Do they have any adverse effects? The big rivers in China are like the Yellow River...

"The Impact of Human Activities on the Earth's Surface" Changes in the Earth's Surface PPT Courseware 2:

"The Impact of Human Activities on the Earth's Surface" Changes in the Earth's Surface PPT Courseware 2 Thinking: Which human activities are constantly changing the morphology of the Earth's surface? Follow the laws of nature to change the surface form. For example: reclamation, excavation of rivers, construction of reservoirs, greening deserts; construction...

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Update Time: 2024-06-22

This template belongs to science courseware People's Education Press Fifth Grade Science Volume 2 industry PPT template

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