"Care for Water Resources" Water in Nature PPT Courseware 5

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"Care for Water Resources" Water in Nature PPT Courseware 5

learning target

1. Understand the existence and distribution of water on the earth; know that the freshwater resources that humans can directly use are extremely limited.

2. Understand the status of water resources on the earth and in our country; know that water shortage has become a global problem.

3. Understand the causes, hazards and prevention measures of water pollution.

1. Water resources owned by humans—both abundant and scarce

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. Take care of water resources - cherish every drop of water!

Specific measures to protect water resources

1. 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. Prevent water pollution

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.

Knowledge point 1: Water resources owned by humans

【Example 1】Water is the source of life, both common and precious. Which of the following descriptions of "more" and "less" water is wrong ( )

A. The total amount of water on the earth is large, but fresh water is small

B． my country has a large amount of water resources but a small amount of water per capita

C. The "South-to-North Water Diversion" project shows that there are more water reserves in the south and less water reserves in the north.

D． There are many countries with abundant water resources in the world, but very few countries with water shortages.

[Typical Example 2] (2010·Lanzhou High School Entrance Examination) In April 2010, southwest my country suffered a severe drought that was rare in history, causing tens of thousands of people and animals to have difficulty drinking water. Therefore, we must enhance the awareness of water conservation. Which of the following practices has nothing to do with saving water ( )

A. Water the flowers with rice water

B． Develop and utilize groundwater

C. Use water-saving faucets

D． Water crops using sprinkler and drip irrigation methods

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For more information about the PPT courseware "Nature's Water and Protecting Water Resources", please click on the Nature's Water ppt and Protecting Water Resources ppt tag.

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Update Time: 2024-11-22

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 1 industry PPT template

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