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Authoritative PPT Summary
"Development, Utilization and Protection of Water Resources" The most common liquid - water PPT courseware
1. Care and protect water resources
1. Overview of Earth’s water resources
①The total water volume is large:
The water on the earth is about 1.39×1018m3, and about 71% of the earth’s surface is covered by water.
Ocean water storage accounts for 96.5% of the world's total water storage.
②Lack of fresh water resources:
Freshwater accounts for 2.53% of global water reserves, of which only 30.4% is available.
③Uneven distribution of freshwater resources
Per capita water volume in the world and per capita water volume in some countries
Thinking: What are the reasons for the lack of fresh water resources?
①As life progresses, water consumption increases
② Water bodies are polluted
Dangers of water pollution
1. Damage to human health
2. Losses caused by daily life and production activities
3. Destroy the aquatic ecological balance
4. Impact on industrial, agricultural and fishery production
2. Rational development, utilization and protection of water resources
1. Rationally develop water resources and save water
Industry: water recycling
Agriculture: Sprinkler irrigation and drip irrigation are used instead of flood irrigation to irrigate crops
In life: pay attention to the secondary use of water
2. Prevention and control of water pollution and sewage treatment
1. Domestic sewage is discharged after centralized treatment.
2. Use pesticides and fertilizers rationally in agriculture, and encourage the use of farmyard manure.
3. In industry, industrial wastewater must be treated to meet standards before being discharged. Try to adopt new technologies and new processes as much as possible.
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"Development, Utilization and Protection of Water Resources" The most common liquid - water PPT courseware 2:
"Development, Utilization and Protection of Water Resources" The most common liquid water PPT courseware 2 Learning objectives: 1. Understand the status of water resources in the world and my country, and the sources and hazards of water pollution. 2. Understand that water is a precious natural resource and know how to deal with water crises. Highlights: ..