"Our Water Resources" Source of Life - Water PPT Courseware

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"Our Water Resources" Source of Life - Water PPT Courseware

1. We live on a water polo

70.8% of the Earth’s surface is covered by water

2. Life is inseparable from water

All living things contain large amounts of water. Water accounts for 65% of the human body; for organisms living in water, water accounts for a greater proportion of their body weight. For example, jellyfish is 95% and fish is 70%.

water uses

1.In industry

Use water to wash, dissolve, heat or cool substances.

As well as steelmaking, papermaking, coal production, fertilizers, man-made fibers, etc.

2. Agriculture

Irrigated farmland accounts for more than 2/3 of the total fresh water consumed by humans.

3. In life

Daily water use: washing clothes, washing vegetables, cooking, brushing teeth, etc.

3. Our water resources

1.Features

Earth: The total reserves of water resources are large, but the fresh water resources available to humans are limited, accounting for only 0.7% of the total water. Mainly river water, freshwater lake water, shallow groundwater

my country: my country’s total water resources are about 2.8×1012m3, ranking sixth in the world, but its per capita share is about 1/4 of the world’s per capita water. , and the distribution is uneven, it belongs to a water-scarce country.

2. Save water

Industrially, recycled water

In agriculture, sprinkler irrigation and drip irrigation are used to irrigate crops

In life, one water can be used for many purposes

⑴Water the flowers with rice washing water ⑵Laundry water mop the floor and flush the toilet

⑶Shower instead of bathtub ⑷Use a bucket of water to wash the car instead of rinsing with a hose ⑸Repair the broken faucet in time

⑹ Promote the use of water-saving appliances...

1. Main sources of water pollution:

(1) Industrial pollution: three wastes (waste residue, waste liquid, and waste gas) discharged from factories.

(2) Agricultural pollution: unreasonable application of chemical fertilizers and pesticides in agriculture.

(3) Domestic pollution: accumulation of urban garbage everywhere; arbitrary discharge of domestic sewage.

(4) Seawater pollution caused by oil spills.

2. Hazards of water pollution:

Polluted water contains toxic substances such as cyanide, arsenic, mercury, chromium, cadmium, lead, fluorine and bacteria, viruses, etc.

Drinking it will cause direct poisoning.

The use of organisms cultured in polluted waters can also poison or treat people, and in serious cases can cause death.

If polluted water is used for irrigation, it will affect the ecological balance.

3. Prevention and treatment:

⑴Industrial "three wastes" are discharged after treatment meets standards

⑵ Rational use of chemical fertilizers and pesticides in agriculture.

⑶ Domestic sewage should be treated centrally before being discharged. Use phosphate-free laundry detergent.

⑷Legal restrictions and strengthening water quality monitoring

Practice in class:

1. The largest freshwater reservoir on earth is ( )

A. Glacier B. ocean water

C. Groundwater D. atmospheric water

2. Which of the following behaviors will not cause water pollution ( )

A. Wash clothes with phosphorus-containing laundry detergent

B． Throw rubbish into the river

C. Industrial wastewater is discharged without treatment

D． Promote the use of farmyard manure in agriculture

3. The form of water in nature is ( )

A. Gaseous state b. liquid

C. Solid state D. All three states are present

Question to think about: In the South-to-North Water Diversion Project, in order to no longer follow the path of pollution first and treatment later, if you were a chief designer, what specific measures could you propose?

Answer:

(1) The "three wastes" in the factory are strictly prohibited from exceeding the standard.

(2) Rational use of chemical fertilizers and pesticides in agriculture.

(3) Domestic sewage is treated centrally before being discharged.

(4) Use pipeline transportation if necessary.

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For more information about the "Source of Life Water Our Water Resources" PPT courseware, please click the "Source of Life Water ppt Our Water Resources ppt" tag.

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"Our Water Resources" Source of Life Water PPT Courseware 3 Learning Objectives: 1. What is the volume fraction of fresh water in the earth's water resources? 2. What is my country’s per capita freshwater possession in the world? 3. Do you waste water? How to save water and prevent...

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Update Time: 2024-10-19

This template belongs to Chemistry courseware Cantonese Education Edition Ninth Grade Chemistry Volume 1 industry PPT template

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