"Utilization, Development and Protection of Water Resources" PPT courseware

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"Utilization, Development and Protection of Water Resources" PPT courseware

Part One: Water Resources Utilization and Development

Read Figures 1-56 to 1-60 on page 39 of the textbook: What is the close connection between water and human life and production?

Drinking, irrigation, washing, industrial water, etc.

Distribution characteristics of global water resources

1. Uneven spatial distribution.

Among more than 200 countries and regions in the world, Brazil has the richest water resources in South America, followed by Russia, Canada, the United States, Indonesia and China.

2. The per capita water resources vary widely.

How to solve the water shortage problem?

1. Make full use of local water resources, save water, and avoid waste and pollution;

2. Change the water circulation path and conduct cross-basin water diversion.

Utilization, development and protection of water resources PPT, Part 2: Protection of water resources

1. One of the important contents of water resources protection is to save water.

Serious waste of water bodies

1. Waste of domestic water

Seventy percent of precious water is lost inadvertently in people's lives.

If the tap drips water at a rate of one drop per second, then 3.6 kilograms of water can be wasted in one hour. If each household leaves the faucet open for one hour per day, 0.1 tons of water can be collected in one month, and the water leakage in a year will reach 1.3 tons. (In fact, the amount of water dripping in many households every day far exceeds this amount.) Take Shanghai as an example. There are 5.3 million households in Shanghai, and the amount of water wasted every year can reach nearly 100 million tons.

2. Industrial water waste

Nowadays, the annual water consumption of global industry accounts for 23% of the total annual water consumption of mankind. Due to incomplete facilities of industrial enterprises and low water recycling rate, huge water waste has been caused.

In addition, some industries themselves are water-wasting, such as the car washing industry. Beijing uses a Kunming Lake of water to wash cars every year.

3. Agricultural water waste

Humans use about 70% of freshwater resources for agriculture. Agricultural production requires a lot of water. It takes 1,000 tons of water to produce 1 ton of grain.

The water used for farmland irrigation is often transported from water sources through channels. During the water transport process, part of the water will leak downward and fail to reach the fields. This kind of water loss along the way generally accounts for 50%-60% of the water delivery volume, and in some places it even reaches 70%. What a pity!

Utilization, development and protection of water resources PPT, Part 3: Exercises

1. According to the on-site report of "World Environment Day": When the sweet and clear water from the source of the Yangtze River reaches the mouth of the sea, the visibility of the water is less than 10 centimeters. The main reason is that a large amount of ( ) flows into it along the way.

① Domestic sewage ② Industrial wastewater ③ Sediment ④ Ordinary rainwater

A． ①②③④ B. ①③ C. ①②③ D. ①②

2. How much water did your home use in the past month? Hold a family meeting to discuss the issue of water conservation, put forward some suggestions for improvement, and encourage the whole family to implement them together.

3. Investigate what sources of water pollution exist around you, put forward ideas or suggestions for prevention and control, communicate with classmates in the group, and write a proposal.

Keywords: Zhejiang Education Edition eighth grade science PPT courseware free download, water resources utilization, development and protection PPT download, .PPT format;

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"Utilization, Development and Protection of Water Resources" PPT:

"Utilization, Development and Protection of Water Resources" PPT Part One: Thoughts and Discussion Discussion: From the perspective of the water cycle, to summarize, what are the common characteristics of several freshwater bodies that humans currently use more? Answer: Humans currently use more freshwater bodies Several types of fresh water include lake water...

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Update Time: 2024-11-26

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 1 industry PPT template

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