"Water on Earth" Blue Earth PPT Courseware 2

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"Water on Earth" Blue Earth PPT Courseware 2

Classification of water

1. According to the state of water: solid water, liquid water, gaseous water

2. According to the salt content of water: salt water, fresh water

3. According to the accumulation of water, it is divided into: ocean water, land water, atmospheric water

ocean water

a. The salt content of seawater varies in different parts of the ocean.

The average salinity is 35‰

b. The salt will not evaporate when sea water evaporates.

c. There are a lot of tiny salt particles in the air over the ocean

d. Marine organisms all have the function of eliminating excess salt.

water content of organisms

The water in the human body is called body fluids

Accounting for about 60%~70% of the total body mass

An adult excretes approximately 1.5 kilograms of water through urination every day

Consolidation exercises

1. The state of water on earth is ( )

A. Liquid and solid B. Gas and solid C. Liquid, solid and gas D. Liquid and gas

2. The correct statement about land water is ( )

A. Terrestrial water is all fresh water B. Glaciers and groundwater are not terrestrial water

C. Groundwater is river water D. Land water can be continuously replenished through the power of water cycle

3. The division of ocean water, land water and atmospheric water is based on ( )

A. Physical properties of water B. Chemical properties of water C. Spatial distribution of water D. Water vapor content

4. The average salinity of the world’s ocean water is ( )

A.32‰ B.35 ‰ C.30 ‰ D.41 ‰

5. The mass of water in the human body accounts for approximately ____________ of the total mass of the human body. A person excretes about _______ kilograms of water every day through urination, breathing and skin evaporation.

6. The largest reserve of all kinds of water on the earth is _______ water, and the ones most closely related to industrial and agricultural production are ________ water, _______________ water and _______________ water.

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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: 2024-10-26

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

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