"Water on Earth" Blue Earth PPT Courseware 3

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"Water on Earth" Blue Earth PPT Courseware 3

Based on your life experience, give an example of where water is found on the earth?

One of the main features that distinguishes the Earth from other stars: abundant water

According to the different states of water, it can be divided into three categories: liquid, solid, and gaseous.

According to the different components contained in the water, it can be divided into two categories: fresh water and salt water.

Water can be divided into four categories according to its distribution space: ocean water, terrestrial water, atmospheric water, and biological water.

How can you prove that there is water in the air around us?

Examples: rain, snow, hail, dew, clouds, fog; drying of wet clothes and various evaporation phenomena;

Salt "moistens"; when the refrigerator is cooling, there is frost in the freezer; there is desiccant in the food bag that absorbs water.

Please read textbook P4-P5 to understand the importance of water to life:

1. What substance is most abundant in the human body?

2. Which organism contains the most water?

3.A healthy adult needs an average of __liters of water per day?

discuss

1. All living things are continuously losing water

Animals: breathing, perspiration, urination, defecation

Plants: surface evaporation, transpiration

2. All living things need to constantly replenish lost water.

Animals: drink water, eat

Plants: use their roots to absorb water

synchronous training

1. Among the water bodies on the earth, the most stored water is ( )

A. Atmospheric water B. River water

C. Groundwater D. Ocean water

2. According to the state of the water body, there are mainly ( )

A. Land water, ocean water and atmospheric water

B. Solid water, liquid water and gaseous water

C. Fresh water, salt water and mineral water

D. Surface water, shallow water and deep water

3. Among the following organisms, the one with the most water content is ( )

A. Cucumber B. Jellyfish

C. General animals D. Herbs

4. The average amount of water a healthy adult needs every day is approximately ( )

A. 25 liters B. 2.5 m3

C. 2.5 cubic decimeters D. Optional

Renewal of terrestrial water----water cycle

(1) Concept

The water cycle refers to the process of continuous movement of water in nature through various links in the four major spheres of hydrosphere, atmosphere, lithosphere and biosphere.

(2) Classification

1. Cycle between sea and land----sea and land

2. Marine internal circulation----ocean

3. Inland circulation ------- land

Read textbook P6-P7:

1. Compare the average renewal cycles of various water bodies?

2. Why do you think there is this difference?

3. Discuss and list the human actions that affect the water cycle process on Earth?

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

"The Movement of Sea Water" Water on Earth PPT courseware:

"The Movement of Sea Water" Water on Earth PPT Courseware Part One Content: Explanation of Course Standards 1. Combined with materials, analyze the main causes and effects of waves, tides, and ocean currents. (Comprehensive thinking) 2. Combined with the ocean current distribution map, master the distribution patterns and names of ocean currents in the world's oceans.

"The Movement of Sea Water" Water on Earth PPT:

"The Movement of Sea Water" Water on Earth PPT Part One Content: Learning Objectives: 1. Understand the main forms and characteristics of sea water movement. 2. Understand the main influencing factors of waves and their impact on human activities. 3. Understand the causes of tides and their application characteristics. 4...

"The Nature of Seawater" Water on Earth PPT courseware:

"The Nature of Seawater" Water on Earth PPT courseware Part 1: Explanation of course standards 1. Combined with the chart information, understand the main factors that affect the temperature, salinity and density of seawater. (Comprehensive thinking) 2. Use chart data to summarize the time of seawater temperature, salinity, and density..

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Update Time: 2024-11-25

This template belongs to science courseware People's Education Press Fourth Grade Science Volume 1 industry PPT template

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