"Water Cycle" Water on Earth PPT download

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"Water Cycle" Water on Earth PPT download

Part One: Explanation of Curriculum Standards

1. Draw and use a schematic diagram of the water cycle to explain the process and main links of the water cycle. (geographical practice)

2. Use the schematic diagram of the water cycle to explain the significance of the water cycle. (comprehensive thinking)

Water cycle PPT, part 2: preview of new knowledge

1. Process and types of water cycle

1. Concept

The water cycle refers to the process of continuous movement of natural water in the hydrosphere, atmosphere, lithosphere, and biosphere through evaporation (transpiration), water vapor transport, precipitation, infiltration, runoff, and other links.

2. Types and main links

According to the spatial scope in which it occurs, the water cycle can be divided into inter-sea circulation, intra-terrestrial circulation and intra-sea circulation.

3. Process

Various water bodies on the earth evaporate in large quantities under the action of solar radiation to form water vapor. Water vapor rises into the air and forms precipitation under certain conditions. Water that falls to the ground either evaporates, flows along the ground to form surface runoff, or seeps into the ground to form underground runoff. The two merge into a river and eventually return to the ocean.

Tips ① Internal circulation on land does not only occur in inland flow areas. ②The outflow area has both inter-sea and intra-land circulation.

2. The geographical significance of the water cycle

1. Maintain the dynamic balance of global water volume.

The water cycle organically connects the atmosphere, hydrosphere, lithosphere and biosphere, keeping various water bodies on the earth in a state of constant renewal, thus maintaining the global dynamic balance of water.

A small reminder that within a certain space and time, water resources are limited. If humans use too much water, exceed the rate of water body renewal, or water resources are polluted, it will lead to water shortages.

2. It is an important process of material migration and energy conversion on the earth.

(1) Material migration: Precipitation and surface runoff continuously shape the surface morphology. Surface runoff continuously transports large amounts of sediment, organic matter and inorganic salts to the ocean. The water cycle has become the main link between sea and land.

(2) Energy conversion: It absorbs, transforms and transmits solar radiation energy reaching the surface, alleviating the imbalance of heat budget in different latitudes.

3. It affects the global climate and ecology, and has a profound and extensive impact on the global natural environment.

Water cycle PPT, part three: independent testing

1. Judgment of right and wrong

(1) The water cycle is a process in which water in nature moves continuously only in the outer circle of the earth. ()

(2) Evaporation (transpiration), water vapor transport, precipitation, infiltration, and runoff are the basic links of the water cycle. ()

(3) Among the three types of water circulation, the circulation between sea and land has the largest amount of circulating water. ()

(4) Internal circulation on land only occurs in the inland flow area. ()

(5) The water cycle keeps the water bodies on the earth in a state of constant renewal, so water resources can be inexhaustible. ()

Answer(1)×　(2)√(3)×(4)×(5)×

A middle school student conducted an experiment on the impact of vegetation on the water cycle. The design is as follows: prepare two washboards and place them in a basin as shown in the figure. Cover one with a towel, pour an equal amount of water on each, and observe the experimental results. Complete questions 2~3 accordingly.

2. After two washboards are sprayed with water, what can be observed is ()

A. No towel: larger water flow

B. With a towel: the water flow is faster

C. No towel: greater evaporation

D. There is a towel: there is more water in the pelvic floor

3. If the washboard covered with towels simulates a mountainous area after vegetation restoration, then the mountainous area ()

① Increase in precipitation ② Increase in surface runoff ③ Increase in infiltration ④ Increase in underground runoff

A.①② B.②③ C.③④ D.①④

To analyze question 2, a washboard covered with towels is equivalent to a place with vegetation, and a washboard without towels is equivalent to bare ground. After the two washboards are sprayed with water, the washboard without towels has a fast water flow rate, a large water flow, and more water in the basin bottom; the washboard with towels has a slow water flow rate, a small water flow, and less water in the basin bottom. . Question 3: Vegetation has the function of conserving water sources and maintaining soil and water. After mountainous vegetation is restored, atmospheric humidity increases, surface runoff decreases, infiltration increases, and underground runoff increases.

Answer 2.A　3.C

Water cycle PPT, part 4 content: classroom exploration

What is the process of water cycle? What is its significance?

Question exploration

Our country will strive to launch a global water cycle observation satellite around 2020. As the first earth science satellite in the world to conduct comprehensive observations of global land, ocean and atmospheric water cycle elements, it plays an important role in deepening the understanding of the water cycle. The figure below is a schematic diagram of the water cycle.

Explore with materials:

(1) What are the differences in the spatial range of the water cycle in the figure? What types can it be divided into?

(2) Analyze from the diagram which four major circles of the earth are connected by the water cycle.

(3) Analyze from the diagram what are the main links that humans can influence in each link of the water cycle process.

Tips (1) The spatial scope of the water cycle in the figure is between the ocean and the land, between the land and the sky above the land, and between the ocean and the sky above the ocean. It can be divided into circulation between sea and land, circulation within land, and circulation within sea.

(2) The water cycle connects the earth’s four major spheres: hydrosphere, atmosphere, lithosphere and biosphere.

(3) Surface runoff, infiltration, precipitation, etc.

Water cycle PPT, part 5: In-person testing

The "National New Urbanization Plan (2014-2020)" clearly states that building sponge cities with natural accumulation, natural penetration, and natural purification functions is a major task for my country's urban construction in the future. During the construction process of sponge cities, relevant professionals explored low-impact development of rainwater systems and achieved good results. Low-impact development of rainwater systems refers to the use of ecological measures during the urban construction process to maintain the same hydrological characteristics as much as possible before and after urban construction, effectively mitigating the impact of the increase in total runoff, runoff peaks and runoff pollution caused by the increase in impermeable area. Adverse effects on the environment. The figure below illustrates general urban and sponge city rainwater drainage systems. Complete questions 1~2 accordingly.

1. The following urban constructions are part of the low-impact development stormwater system ()

A. Widen sewers and increase the slope of main roads

B. Pavement with permeable materials and green roofs to store water

C. Cut the bend to straighten the river course and change the flow direction of the river

D. Construction of canals next to roads and plasticization of school playgrounds

2. Compared with ordinary cities, the proportion of water discharge in sponge cities is lower mainly due to ()

A. Recharge during the rainy season and groundwater reserves increase

B. Litter leaves accumulate and surface runoff is slow.

C. The heat island effect is alleviated and the precipitation intensity is reduced.

D. The number of depressions increases and the area of ​​hardened land decreases.

Analyzing question 1, from the meaning of "low impact development of rainwater system" in the material, it can be judged that measures to increase pavement permeability and vegetation are components of this system. Question 2: After precipitation in a sponge city, more water can enter the ground or be stored in low-lying areas on the surface, and less water will be discharged, that is, D is correct.

Answer 1.B　2.D

Keywords: PPT courseware for high school geography required by the People's Education Press is free to download, water cycle PPT download, water on earth PPT download, .PPT format;

For more information about the "Water Cycle on Earth" PPT courseware, please click on the "Water on Earth ppt water cycle ppt" tag.

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Update Time: 2024-11-15

This template belongs to Geography courseware People's Education Press High School Geography Compulsory Course 1 industry PPT template

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