"The Nature and Movement of Sea Water" Water on Earth PPT (The Nature of Sea Water in the First Lesson)

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"The Nature and Movement of Sea Water" Water on Earth PPT (The Nature of Sea Water in the First Lesson)

Part One: Strengthening the Implementation of Basic Knowledge

[Self-reading textbook·Fill in key points]

1. Sea water temperature

1. Concept: Reflects the _____ degree of sea water.

2. Influencing factors

(1) _____: The most important heat source.

(2) Ocean currents: In sea areas where warm and cold currents pass, the water temperature is also affected.

3. horizontal distribution pattern

(1) Seasonal differences: The water temperature in the same sea area is higher in _____ season and lower in _____ season.

(2) Spatial difference:

Water temperature in different sea areas

Differences in latitude: _____ at low latitudes and _____ at high latitudes

Influence of ocean currents: warm current water temperature _____ water temperature in the sea area it flows through, _____ cold current water temperature _____ water temperature in the sea area it flows through

4. vertical distribution pattern

(1) Overall trend: There is generally an uneven _____ trend from the surface to the deep layers.

(2) Differences in changes

Surface area: water temperature basically tends to _____ distribution

Thermocline: Water temperature increases with depth_____

Deep water area: changes _____, temperature deviation

5. relationship with humans

(1) Seawater can regulate the atmosphere _____.

(2) Changes in seawater temperature bring _____ effects.

2. Salinity of sea water

1. Concept: refers to the ratio of _____ substances dissolved in seawater to the mass of seawater, measured by _____ of salt substances contained in seawater.

2. The distribution pattern of salinity in ocean surface water: salinity near the equator _____, salinity in subtropical sea areas _____, and salinity in high latitude sea areas _____.

3. Influencing factors

(1)Comparison of _____.

(2) Cold and warm currents.

(3) _____ injection.

4. Vertical changes in seawater salinity

5. Changes in seawater salinity have a significant impact on fisheries and _____.

3. Density of sea water

1. Influencing factors: temperature, _____ and pressure, etc.

2. Distribution

(1) Horizontal direction: The density of ocean surface water increases with latitude, and the maximum density occurs in the _____ sea area.

(2) Vertical distribution: The density of seawater increases with depth. The vertical changes are larger in low-latitude sea areas and the vertical changes in high-latitude sea areas are _____.

PPT on the nature and movement of sea water, part 2: Pay attention to problem-based teaching

Question 1: What are the patterns of temperature distribution in sea waterBasic test points

[Thinking and exploring]

The bathing beach is a favorite place for local residents and tourists. Our country has a long coastline and many bathing beaches.

[Exploration 1] Analyze the seasonal variation characteristics of seawater temperature in three sea areas.

Tip: The seasonal variation of surface seawater temperature is the largest in Huludao, followed by Xiamen, and Xisha is the smallest.

[Exploration 2] Analyze the differences in the length of time suitable for people to swim in the three sea areas and the main influencing factors.

Tip: Huludao has the shortest swimming time, followed by Xiamen and Xisha the longest. The main influencing factor is latitude.

[Exploration 3] Xiao Wang, who lives in Jinan, wants to travel during the winter vacation. At the same time, he wants to enjoy winter swimming at the beach. Which tourist destination do you think he will choose? What's the reason?

Hint: Xisha. The surface water temperature in Xisha is still above 25°C in winter, making it suitable for swimming.

[Training to pass the test]

1. The main source of heat in the ocean comes from ()

A. Solar radiation b. Ground radiation

C. Atmospheric radiation D. atmospheric reverse radiation

2. Which of the following statements about seawater temperature distribution is incorrect ()

A. The temperature of sea water decreases with depth

B． The water temperature of the ocean surface decreases from low latitudes to high latitudes

C. Surface water temperatures in the same sea area are generally lower in summer than in winter

D. The temperature changes of deep seawater below 1 000 m are smaller.

3. The following statement about the curve of water temperature changing with depth at an observation station at 170°W in the Pacific Ocean (as shown on the right) is incorrect ()

A. The highest surface water temperature

B． Seawater temperature decreases with depth

C. The seawater temperature above 1 000 m does not change much with depth.

D. The seawater temperature below 1 000 m does not change much with depth.

Question 2: What are the rules of salinity and density distribution of seawaterBasic test points

[Thinking and exploring]

Seawater contains a large amount of sodium chloride, magnesium chloride and other salt substances. Edible salt and industrial salt needed for daily life and production can be produced by evaporating seawater. The Changlu Saltworks on the Bohai Sea coast of my country, the Yinggehai Saltworks on Hainan Island, and the Butai Saltworks in Taiwan are all famous saltworks. Yancheng City in Jiangsu Province is famous for its production of sea salt since ancient times, so it was named "Yancheng".

[Exploration 1] Analyze the formation conditions of Yinggehai Salt Field in Hainan Island.

Tips: It is located on the coastal plain with flat terrain; it is located on a leeward slope with less precipitation and more sunny days, which is conducive to seawater salt exposure.

[Exploration 2] Tell us the season and reasons why the Changlu Salt Field on the coast of the Bohai Sea is most suitable for seawater salt drying.

Tip: Spring. There is less precipitation and more sunny days in spring. It is also windy and has high evaporation.

PPT on the nature and movement of sea water, part three: carrying out structural evaluation of thinking

Structural evaluation of thinking - the gift of sea water "salt"

Salt is a necessity in our lives, and our country has a long history of drying salt. So far, my country has formed three famous salt fields - Changlu Salt Field, Butai Salt Field and Yinggehai Salt Field. (1) Changlu Salt Farm: The salt farm with the largest sea salt production in my country, accounting for a quarter of the country’s total sea salt production. It is mainly distributed along the Bohai Sea coast of Hebei Province and Tianjin City, starting from Huanghua in the south to Shanhaiguan in the north. (2) Budai Salt Field: The largest salt field in Taiwan Province, located on the southwest coast of Taiwan Island. (3) Yinggehai Salt Field: The largest sea salt field in Hainan Island, located on the southeast coast of Lexi. Based on this discussion, what are the favorable natural conditions for the formation of salt fields?

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Update Time: 2024-09-16

This template belongs to Geography courseware Hunan Education Edition High School Geography Compulsory Course I industry PPT template

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