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

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

Part One: Strengthening the Implementation of Basic Knowledge

[Self-reading textbook·Fill in key points]

1. Waves

1. Formation: Most waves are formed when _____ blows across the ocean surface and transfers energy to the body of water. The stronger the wind, the bigger the waves.

2. Impact: With its huge energy, waves carry out _____ and _____ effects near the coast.

3. Waves and human activities

(1) Tsunami: Huge waves caused by _____, volcanic eruptions, etc. are called tsunamis.

(2) Impact on human activities: using waves to carry out sports events, _____, etc.

2. Tide

1. Concept: The water level of sea water _____ rises and falls due to the tidal force of celestial bodies.

2. Influence: shape _____.

3. and human activities

(1) _____, shipping and transportation, military activities, fishing, salt and aquatic industries, offshore _____ and pollution control are all closely related to tidal phenomena.

(2)_____ generate electricity.

3. Ocean currents

1. Concept: The seawater in the ocean flows in a regular and large-scale along a certain _____.

2. Classification

_____: The water temperature in the ocean current is higher than the water temperature reaching the sea area

_____: The water temperature of the ocean current is lower than the water temperature reaching the sea area

3. Impact:

(1) Promoting the transportation and exchange of _____ between high and low latitudes plays an important role in global _____.

(2) It has a great influence on the coastal climate. The warm current has a _____ effect on the coastal climate, while the cold current has a _____ effect on the coastal climate.

4． and human activities

(1) Affects the distribution of marine biological resources and _____.

(2) Affect the ocean _____.

(3) Affects marine pollutants, is conducive to the diffusion of pollutants, _____ the purification speed, but also _____ the scope of pollution.

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 impacts of waves and tides on human activities? Basic test points

The Qiantang tide is a tidal phenomenon that occurs in the Qiantang River in Zhejiang, my country. The Qiantang River is located in Zhejiang Province, my country, and eventually flows into the East China Sea. The tide at its mouth is the Qiantang Tide, which is famous all over the world. Every year, many tourists come to watch this spectacle. Before the arrival of the tide, a tiny white dot first appeared in the distance, and in a blink of an eye it turned into a ray of silver, and accompanied by bursts of thunderous tide sounds, the white line rolled in. With almost no time for people to react, the surging tide has roared in. The peak of the tide is 3 to 5 meters high. The waves behind are catching up with the waves ahead, one on top of another, like a long white belt, with the potential to overwhelm mountains and seas. The poem says: "When you look at the Qiantang, there are waves, and suddenly the waves are in front of you; the seemingly ordinary river water contains astonishing energy." There has always been a folk custom of watching the Qiantang tide on the 15th day of the eighth lunar month.

[Exploration 1] Analyze the reasons why the Qiantang tide is so spectacular.

Tips: ① Time: On the 15th day of the eighth lunar month, the sun, moon, and earth are almost in a straight line, so the tidal force on the seawater is the greatest on this day. ② Geographical location: It is related to the trumpet-like shape of the Qiantang River Estuary. ③Wind force: The southeasterly wind prevails along the coast, and the wind direction is generally consistent with the direction of the tide, which contributes to the tide.

[Exploration 2] Do you think how to make full use of the tidal phenomenon to serve mankind?

Tips: Use the intertidal zone for collection and breeding, and use the tidal water level difference to generate electricity, etc.

[Training to pass the test]

1. Which of the following statements about the impact of waves on human activities is incorrect ()

A. Surfing with wind and waves

B． Waves help people go fishing

C． Waves facilitate the dispersion of pollutants and water purification

D． Waves can be used to generate electricity

2. Which of the following statements about tides is correct ()

A. The cause of tides is only related to the gravitational pull of the moon on the earth

B． During a day, four rises and falls of sea water can usually be observed

C． The rise and fall of the sea water at night is called a tide, and the rise and fall of the sea water during the day is called a tidal wave.

D． The tidal phenomenon is most obvious around the first and fifteenth days of each month in the lunar calendar.

Wave energy refers to the kinetic and potential energy of waves on the ocean surface, which is formed when wind blows across the surface of the ocean and transfers energy to the water. At present, the main way to utilize wave energy is to generate electricity. The figure below is a statistical chart of the proportion of wave energy in different directions to the total wave energy in a certain area of ​​the East China Sea in my country. Complete questions 3 to 4 accordingly.

3. The season with the most abundant wave energy in this sea area is ()

A. Spring B. Summer

C. Autumn D. Winter

4． Compared with the northern Bohai Sea, the favorable conditions for wave energy development in this area are ()

A. The depth of the sea is small B. Closer to the land

C. The sea area is not frozen D. The consumer market is close

PPT on the impact of seawater properties and movement on human activities, part three: carrying out structural evaluation of thinking

Structural evaluation of thinking - German submarines and ocean currents

The Strait of Gibraltar is a narrow waterway connecting the Atlantic Ocean and the Mediterranean Sea. During World War II, German submarines often entered and exited the Strait of Gibraltar from the Mediterranean Sea and attacked the Allied forces in the Atlantic Ocean. The Allies suffered several losses, so they sent warships to guard the strait and used sonar to monitor. They planned to use it as soon as they heard the sound of the submarine's motor. Depth charges blew it up. After several days of monitoring, there was no sound, but the German troops were right under the nose of the Allied forces, entering and exiting the Strait of Gibraltar several times as if they were in uninhabited territory. Do you know why? Please contact its geographical features to discuss.

[Your evaluation and thinking are perfect]

Student A did not grasp the essence of the question, and his answer was far off topic; Student B's answer was of a multi-point structure, with accurate key points, but did not make a specific analysis based on its geographical characteristics; Student C's answer was of a relational structure, with a clearer idea, and the answer was Key points, but there is a lack of targeted analysis on how to "get out" and "enter", so the answer is slightly lacking.

[Example of perfect thinking]

Summers in the Mediterranean are hot, and the seawater has high salinity and density. In the adjacent Atlantic Ocean, the salt content of seawater is lower than that of the Mediterranean Sea, and the density of seawater is smaller. This will cause the surface water of the Atlantic Ocean to enter the Mediterranean Sea through the Strait of Gibraltar, while the salty water of the Mediterranean Sea will flow into the Atlantic Ocean from the bottom. The Germans took advantage of this rule. When diving out of the Mediterranean Sea, they turned off the engine, dropped to a relatively deep area below the sea surface, and followed the underlying ocean currents out of the Mediterranean Sea to the Atlantic Ocean. When diving in, they raised the submarine to a relatively shallow area. area, turn off the engine, and flow back to the Mediterranean Sea along the surface ocean currents.

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