"The Nature of Seawater and the Impact of its Movement on Human Activities" Physical Geographic Elements and Phenomenon PPT (The Nature of Seawater and its Impact on Human Activities in the First Lesson)

"The Nature of Seawater and the Impact of its Movement on Human Activities" Physical Geographic Elements and Phenomenon PPT (The Nature of Seawater and its Impact on Human Activities in the First Lesson)

Part One: Strengthening the Implementation of Basic Knowledge

[Self-reading textbook·Fill in key points]

1. Nature of sea water

1. The meaning and distribution characteristics of seawater properties

(1) Meaning: refers to the salinity, temperature and density of seawater.

(2) Distribution characteristics: _____ distribution along the latitudinal direction in the surface layer. That is, there is little change in the east-west direction and significant change in the north-south direction; in the vertical direction, it is basically distributed in _____, and with the increase of depth, the difference in the horizontal direction gradually decreases.

2. The salinity and distribution of seawater

3. Sea water temperature and its distribution

4． Density and distribution of sea water

2. The impact of seawater properties on human activities

1. Seawater salinity and salt production: The use of seawater _____ is one of the production activities most closely related to people's lives. The main salt fields in China include Tianjin Changlu Salt Field, Taiwan Butai Salt Field, and Hainan _____ Salt Field.

2. Desalination: Desalination can solve the _____ shortage crisis currently faced by mankind. Desalination has become one of the effective ways to solve the freshwater shortage problem in some coastal countries and regions.

3. Seawater temperature changes and abnormal weather phenomena: Temporal and spatial changes in seawater temperature have a profound impact on _____, navigation, fishing, etc. Typhoons generated on the tropical sea bring heavy rain to coastal areas, causing floods and abundant precipitation.

4． Density changes of seawater and navigation: Changes in seawater density have a direct impact on detectors and submarines navigating in the sea, especially in deep seas, and also have an important impact on communication cables located on the seabed.

The nature of seawater and the impact of movement on human activities PPT, part 2: Pay attention to problem-based teaching

Question 1: What are the rules 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 take advantage of the winter vacation to travel. 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 heat source of sea water comes from ()

A. Solar radiationB. 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． The surface water temperature in the same sea area is 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 (pictured) 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.

Read the distribution curve of ocean heat budget in the Northern Hemisphere and answer questions 4 to 5.

4． Which statement about ocean heat revenue and expenditure is correct ()

①The net heat income gradually decreases from low latitude sea areas to high latitude sea areas ②The heat budget of each latitude sea area is basically balanced ③The equatorial area has the highest heat income, and the polar sea area has the largest heat expenditure ④The main income of ocean heat is solar radiation, and the main expenditure is seawater Evaporation heat consumption

A. ①② B． ③④ C. ②③ D. ①④

5. Which statement about ocean surface temperature is correct ()

A. The water temperature in the sea area where the warm current flows is higher than that in the sea area where the cold current flows

B． Ocean currents can reduce the difference in water temperature between high and low latitude sea areas

C． Thermal radiation is the main way of heat exchange between sea areas at various latitudes

D． The annual variation range of water temperature in coastal areas is smaller than that in the middle of the ocean at the same latitude.

Analysis: Question 4, reading the picture shows that the net heat income is greater at low latitudes, and is negative at mid- and high latitudes, and the negative value gradually becomes larger, so ① is consistent with the meaning of the question; there is a heat surplus in sea areas at low latitudes, and heat at high latitudes Loss, so ② does not meet the meaning of the question; from reading the picture, we can see that the subtropical sea area has more heat income than the equatorial area, so ③ does not meet the meaning of the question; the main income of ocean heat comes from solar radiation, and the expenditure is mainly due to evaporation heat consumption, so ④ fits the meaning of the question . Question 5: At the same latitude, the water temperature in the sea area where warm currents flow through is higher; ocean currents flow between low latitudes and high latitudes, which continuously transports and exchanges heat between high and low latitudes, thereby reducing the temperature difference; the annual variation range of water temperature The offshore area is larger than the middle ocean at the same latitude. So choose option B for this question.

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 impact of seawater properties and movement on human activities, 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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