"Care for Water Resources" Water in Nature PPT Courseware 4

Description

"Care for Water Resources" Water in Nature PPT Courseware 4

learning target

Water resources are abundant, but fresh water resources are scarce.

Water pollution and its hazards.

Protection and utilization of water resources.

All living things contain water

The types of living things on the earth vary widely, but they have one common characteristic: the ratio of the mass of water in the body to the total mass of the organism (also known as the mass fraction) is generally above 60%.

one. Water brings pleasing spiritual enjoyment to human beings.

Summary: Physical Properties of Water: Colorless, odorless liquid. Water, like air, is a precious natural resource

What are the causes of water stress?

1. Water consumption for human life and production is constantly increasing.

2. Any discharge of untreated wastewater, waste and domestic sewage.

3. Unreasonable application of pesticides and chemical fertilizers, etc.

4. my country’s water resources situation

my country ranks sixth in the world in total water resources, but its per capita water volume ranks only in the 80s, about a quarter of the world's per capita water volume.

As illustrated by the picture above:

1. Most areas in our country are in water shortage.

2. Areas with per capita water volume above 3000m3 include Tibet, Qinghai, Yunnan, Xinjiang, etc.

3. Areas with extreme water shortage include Tianjin, Ningxia, Shanghai, Beijing, etc.

4. The distribution of water resources is uneven.

1. Which of the following statements is wrong ( )

A Fresh water is widely distributed in nature, accounting for about 3/4 of the earth’s surface area.

B Water in animals and plants and in the atmosphere plays a role in maintaining physiological activities and climate.

C All colorless and transparent water is drinkable

D Water is not infinite, so we must save water

2. my country has a large population, and its per capita water availability is only 1/4 of the world’s per capita water availability. The per capita amount of water in the world is 10,520 cubic meters, while in my country it is only ______ cubic meters

3. If a faucet drips 2 drops of water per second, and the average 20 drops of water is 1 ml, how many liters of water is leaked throughout the day and night?

4. The correct one of the following statements is [ ]

A. Colorless and transparent liquids are water

B. Among the three industrial wastes, only wastewater can cause water pollution.

C. Goiter and dental caries are prevalent in some areas due to the lack of iodine and fluorine in drinking water.

conserve water:

1. Do not leave the faucet running for long to wash your hands, clothes or vegetables.

2. Showering with a nozzle saves 80% of the water compared with bathing in a bathtub; so it is best to use a shower. When taking a bath, you should avoid showering for too long and run the water intermittently.

3. When using the washing machine or washing dishes, collect the clothes or dishes and wash them together.

4. A leaking faucet can consume 70 liters of water per day; to avoid waste, it should be repaired immediately.

5. Use paper to wipe off oil stains on cooking utensils and tableware before washing to save water; when washing vegetables and fruits, you should control the flow of the faucet.

On the other hand, to prevent water pollution:

1. Industrial pollution ("three wastes" wastewater, waste residue, and waste gas)

2. Agricultural pollution (arbitrary application of pesticides and chemical fertilizers)

3. Domestic pollution (arbitrary discharge of domestic sewage)

What is water pollution

Water pollution refers to a situation where a large amount of pollutants are discharged into a water body, exceeding the self-purification capacity of the water body, causing water quality to deteriorate, destroying the ecological balance of the water body and its surroundings, causing losses and threats to human health, life, and production activities.

The sources of water pollution include: industrial pollution, agricultural pollution and domestic pollution

What harm does water pollution cause?

1. Affect industrial and fishery production and damage aquatic ecosystems

2. Endanger human health.

How to prevent water pollution?

① Establish environmental awareness

②Industrial wastewater is discharged after treatment

③ Domestic sewage is discharged after centralized treatment

④Use pesticides and fertilizers rationally

Class summary

1. Water resources owned by the human body: Water resources on the earth are abundant, but the available fresh water resources are limited.

2. What are the causes of water pollution? (three sides)

3. What are the measures to protect water resources? (both aspects)

4. How to care about, care for, and protect water?

Keywords: water teaching courseware in nature, teaching courseware on caring for water resources, PPT courseware download for the first volume of the ninth grade chemistry of the People's Education Edition, downloading chemistry slide courseware for ninth grade, downloading PPT courseware on water in nature, downloading PPT courseware on caring for water resources, .PPT Format;

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.

"Care for Water Resources" Water in Nature PPT Courseware 7:

"Care for Water Resources" Water in Nature PPT Courseware 7 1. Water resources owned by humans 1. In what forms does water exist on the earth? Approximately what percent of the earth's surface is covered by water? 2. What is the largest water storage reservoir on earth? 3. The total water storage capacity is: 1..

"Care for Water Resources" Water in Nature PPT Courseware 6:

"Care for Water Resources" Water in Nature PPT Courseware 6 1. Water resources owned by humans 1. Distribution proportion of water in nature The ocean is the largest water storage reservoir on the earth, and its water storage accounts for about 96.5% of the world's total water storage. There are more than 80 chemical elements contained in seawater. land..

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

"Care for Water Resources" Water in Nature PPT Courseware 5 Learning Objectives 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...

File Info

Update Time: 2024-10-10

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

Preview