| Category | Format | Size |
|---|---|---|
| E-education edition fifth grade science volume 2 | pptx | 6 MB |
"Pollution and Protection of Waters" PPT courseware
Description
"Pollution and Protection of Waters" PPT courseware
Discussion and reflection
Hunan has many lakes and the Yangtze River passes through it, so our hometown is an area rich in water resources. So have you observed the rivers and lakes around us? Are they contaminated? Tell us what you saw and heard.
Let’s talk about it:
Combine your usual observations with the pictures just now, and tell us your thoughts.
Everyone wants to have clean and pollution-free water to live, but it is humans who have polluted these precious water sources.
The main problems existing in my country’s water resources:
The per capita amount of water resources in my country is small;
Water resources are unevenly distributed across regions
Floods and droughts are frequent.
Industrial waste
Steel plants, coking plants, refineries, chemical plants, paper mills, pesticide plants and tanneries are all heavily polluting enterprises. They not only discharge large amounts of wastewater, but also produce a lot of waste gas and waste residue.
Agricultural chemical pollution
Toxic pesticides and fertilizers sprayed on farmland are washed away by rain and enter natural waters, causing pollution.
domestic sewage
It refers to the wastewater discharged during our daily washing of clothes, vegetables, bathing, etc.
Keywords: Water pollution and protection teaching courseware, E-education edition fifth grade science PPT courseware download, volume 2, fifth grade science slide courseware download, Water pollution and protection PPT courseware download, .PPT format;
For more information about the "Pollution and Protection of Waters" PPT courseware, please click the "Pollution and Protection of Waters" ppt tab.
File Info
Update Time: 2024-07-02
This template belongs to science courseware E-education edition fifth grade science volume 2 industry PPT template
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