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"Water Cycle and Water Resources" Material Form and Its Changes PPT Courseware 2
teaching objectives
1. The three-state changes in water availability illustrate some water cycle phenomena in nature.
2. Understand the water resources situation in our country and local areas, and know the water resources crisis faced by mankind.
3. Understand the process and significance of the water cycle on the earth by reading materials and observing pictures.
4. Investigate the utilization status of local water resources and put forward your own opinions on the effective and reasonable use of water resources.
5. Develop an awareness of caring about the environment and saving water, and develop the habit of saving water and protecting water resources in your life.
Detection Preview Exchange Display
Know the three-state changes of water and some water cycle phenomena in nature.
Paths of water cycle: ① Evaporation ② Precipitation ③ Water vapor transport ④ Runoff ⑤ Transpiration ⑥ Infiltration
Discussion and exchange: What is the significance of the water cycle?
1. Connect the lithosphere, hydrosphere, atmosphere and biosphere, and exchange energy among them to transfer materials.
2. Make various water bodies transform into each other and keep water resources updated and clean.
3. Enable human beings to obtain inexhaustible water resources.
2. Clouds, rain, hail, snow, fog, dew, frost
When water vapor in the air is cooled, it liquefies into tiny water droplets or condenses into small ice crystals. A large number of water droplets and small ice crystals form clouds in the high sky.
Small water droplets and small ice crystals in the clouds condense with each other and become larger and larger. In the process of falling, the ice crystals melt into water, which is rain.
In the process of falling, small water droplets encounter cold air below 0°C, and the water droplets quickly solidify into ice droplets. Driven by the updraft, they rise. The ice droplets become larger and larger. When they fall, they become hailstones.
It's very cold at high altitudes, and the water vapor cools down rapidly and condenses directly into small hexagonal ice crystals, which is snow.
At night or in the morning, when the ground temperature drops, water vapor liquefies into small water droplets, forming fog.
When the temperature is below 0°C, water vapor condenses directly into small ice particles that adhere to vegetation and roof tiles, which is frost.
One water, multiple uses
(1) After using face wash, you can wash your feet and then flush the toilet.
(2) A large bucket for collecting waste water should be prepared at home, which can fully guarantee the amount of water required for flushing the toilet.
(3) Rice washing water, the water used to cook noodles, is used to wash dishes and chopsticks to remove oil and save water.
(4) The water used for fish farming can promote the growth of flowers and trees.
Save water in bathing
Take a shower with a shower head:
(1) Learn to adjust the ratio of hot and cold water.
(2) Do not leave the water on the nozzle all the time, let alone leave it open.
(3) Get wet from head to toe as much as possible, then apply soap and scrub the whole body, and rinse thoroughly for the last time.
(4) When taking a bath, you must concentrate on taking a shower and take your time. Do not take it leisurely or chat while washing. Don't even have a big fight with your best friends in the bathroom.
Operation:
Classwork: Questions 1, 2, and 3 on page p108.
Tutorial (preview): a. What is quality? What are the units of quality? How to convert? How to understand that mass is the basic property of objects? b. Understand the structure of the balance. Read the instruction manual for your balance.
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"Water Cycle and Water Resources" Material Forms and Changes PPT Courseware:
"Water Cycle and Water Resources" Material Forms and Changes PPT Courseware Learning Objectives 1. Be able to explain some water cycle phenomena in nature through the three-state changes of water 2. Know the application of water in life and production technology, and understand the significance of water to human survival 3 .by surveying local water..