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

Description

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

Part One: Explanation of Curriculum 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. (regional awareness)

3. Use examples to illustrate the impact of ocean currents on the geographical environment, and cultivate students' ability to solve practical geographical problems from a comprehensive analysis point of view and their ability to transfer knowledge. (comprehensive thinking)

PPT on the movement of sea water, part 2: preview of new knowledge

The most basic forms of movement of surface seawater: waves, tides, and ocean currents.

1. Waves

1. The formation of waves

(1) Waves: The most common waves are formed by wind. The higher the wave height, the greater the energy.

(2) Tsunami: Undersea earthquakes, volcanic eruptions or underwater landslides and collapses may cause fluctuations in sea water and even form huge waves, which are called tsunamis.

(3) Storm surge: Under the action of strong winds, the sea level in coastal areas rises and falls sharply, which is called storm surge.

2. The effect of waves

(1) People who are active on the beach and at sea need to choose suitable wave conditions for activities.

(2) Tsunamis and storm surges have huge energy and often bring catastrophic consequences to coastal areas.

(3) The main driving force that shapes coastal landforms.

(4) It has an impact on maritime operations, ship navigation, ocean engineering, fishery operations, etc.

2. Tide

1. Tide concept

Tides refer to the periodic rise and fall of sea water due to the gravitational pull of the moon and the sun on the earth. The ancients called the rise and fall of sea water during the day as tides, and the rise and fall of sea water at night as tides, collectively called tides.

Reminder

Causes of tides

Ocean tides are mainly caused by the tidal force of the moon. The sea water on the earth is affected by two forces: one is the gravitational force of the moon on the earth, and the other is the inertial centrifugal force generated when the earth rotates around the common center of mass of the earth and the moon. The resultant of these two forces is the lunar tidal force.

2. Occurrence pattern

(1) Diurnal variation: In a day, you can usually see the rise and fall of sea water twice.

(2) Monthly changes: Around the first and fifteenth day of each month in the lunar calendar, the tidal phenomenon is most obvious, with the tide rising to the highest and falling to the lowest.

3. Tidal influence

Along the coast, the times of rising and falling tides are accurate and can be checked. Many of people's activities at the seaside, such as intertidal collection and breeding, coastal construction of ports and shipping, tidal power generation, etc., require full understanding and utilization of tidal patterns.

Reminder

Tides can be divided into neap tides and spring tides according to the degree of rise and fall.

(1) During the movement of celestial bodies, when the moon, the earth and the sun form a right angle, the tidal forces of the moon and the sun partially offset each other, and the difference in the rise and fall of the sea surface becomes small, forming a neap tide.

(2) When the sun, moon and earth are roughly in a straight line, the tidal force of the moon and the tidal force of the sun are superimposed to form a spring tide.

(3) Estuary tides: The estuary area is affected by the shape of the estuary, the friction effect of the river bed and the upstream runoff, which will form unique estuary tides. Estuary tides are divided into three categories according to the size of the tidal range: strong tidal estuaries, such as the Qiantang River Estuary; medium-strength tidal estuaries, such as the Yangtze River Estuary; and weak tidal estuaries, such as the Pearl River Estuary.

PPT on the movement of sea water, part 3: independent detection

1. Judgment of right and wrong

(1) The four elements of ocean waves are wave crest, wave trough, wave height and wavelength. ()

(2) People’s activities on the beach and at sea need to pay close attention to the wave forecast, and all activities must avoid large waves. ()

(3) In a day, the rise and fall of sea water can usually only be observed once. ()

(4) Along the coast, the times of rising and falling tides are irregular. ()

(5) The scale of ocean currents is huge, far exceeding the flow of rivers. ()

(6) The water temperature of warm currents must be higher than that of cold currents. ()

Answer(1)√　(2)×　(3)×　(4)×　(5)√　(6)×

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

A. Wind waves, tsunamis, and ocean currents are the three main forms of seawater movement.

B. Tsunami is a form of strong tidal development, which brings huge energy to human beings

C. Tides are the periodic rise and fall of sea water under the gravitational pull of the sun and moon.

D. The rising sea water in the morning is called a tide, and the falling sea water in the evening is called a tidal wave.

There are many forms of analysis of seawater movement, mainly three types: waves, tides, and ocean currents. The rise and fall of sea water during the day is called tide, and the rise and fall of sea water at night is called tide. It is a periodic rise and fall of sea water that occurs under the gravitational pull of the sun and moon.

AnswerC

3. The correct combination of the following seawater movements and energy sources is ()

A. Waves—density difference

B. Tsunami - the gravitational pull of the moon and the sun

C. Wind and waves—solar radiation

D. Ocean currents—undersea earthquakes and volcanic activity

Analysis Waves are a form of seawater movement formed by wind; tsunamis are huge waves caused by submarine earthquakes, volcanic eruptions or storms; the formation of ocean currents is related to factors such as wind, temperature and salinity.

AnswerC

4. Among the forms of sea water movement, the most destructive to human beings is ()

A. Wave B. Tsunami C. Tide D. Ocean current

Analysis: Tsunamis are caused by submarine volcanoes and earthquakes. They have huge energy and are the most destructive.

Answer B

PPT on the movement of sea water, part 4 content: classroom exploration

How are tsunamis formed? What effects will they have?

Question exploration

Tsunamis are destructive waves generated by submarine earthquakes, volcanic eruptions, submarine landslides or meteorological changes. The wave speed of a tsunami is as high as 700 to 800 kilometers per hour, and it can cross the ocean in a few hours; its wavelength can reach hundreds of kilometers, and it can propagate thousands of kilometers with very little energy loss. In the vast ocean, the wave height is less than 1 meter, but when it reaches the shallow waters of the coast, the wavelength is shortened and the wave height increases sharply, up to tens of meters, forming a "water wall" containing huge energy.

Tsunamis are extremely destructive. The 1755 Lisbon earthquake was the most destructive earthquake in modern European history, and the tsunami it caused was also the largest tsunami that Europe has ever directly encountered. The earthquake and tsunami almost burned down the entire Lisbon, killing 1/3 of Lisbon's population, about 90,000 people, and the entire Portuguese national power also declined.

Explore with materials:

(1) What are the causes of tsunamis?

(2) What are the impacts of the tsunami?

Tips (1) Tsunamis are destructive waves generated by submarine earthquakes, volcanic eruptions, submarine landslides or meteorological changes.

(2) Destroy cities, villages and roads; damage port facilities; collapse buildings; causing serious harm to human life and property.

Lectures by famous teachers

Types, causes and effects of waves

Analysis of typical cases

Example: On September 20, 11498, an earthquake measuring 8.3 on the Richter scale caused a tsunami along the coasts of Kii, Mikawa, Izu and other places in Japan. The powerful tsunami destroyed the cape that separates Lake Hamana from the sea. The tsunami swept through homes in the area, killing at least 31,000 people. Complete the following questions accordingly.

(1) This tsunami belongs to ()

A. Wave B. Tide C. Ocean current D. Cold wave

(2) Which two plates did the earthquake that triggered the tsunami occur between ()

A. Eurasian Plate and Pacific Plate

B. Eurasian Plate and Indian Ocean Plate

C. Indian Ocean Plate and Pacific Plate

D. Indian Ocean Plate and Oceania Plate

PPT on the movement of sea water, part 5: In-person testing

1. Regarding the description of sea water movement, the correct statement is ()

A.Tsunami is the most common type of wind wave

B. Tsunamis are caused by the gravitational pull of the sun and moon

C. The average flow velocity in the surface layer of the ocean current is larger, and the flow velocity decreases deeper into the ocean.

D. In a day, the rise and fall of sea water can usually be observed once

Analysis Wind waves are the most common type of waves, which are caused by wind; tsunamis are not caused by wind, nor by the gravity of the sun and moon, but mainly by submarine earthquakes, volcanic eruptions or underwater collapses or caused by landslides. During a day, two rises and falls of sea water can usually be observed.

AnswerC

2. Regarding the tidal phenomenon, which statement is wrong ()

A. Tide is a phenomenon of rising and falling sea water. Its main driving force is the attraction of the sun and the moon to the earth.

B. When the positions of the sun, moon, and earth are roughly in a straight line, spring tides will appear in all sea areas around the world at the same time.

C. There are two high and low tides in a day, two spring tides and two neap tides in a month.

D. When the moon, earth and sun form a right angle, neap tides occur in that place

Analysis Tides are the periodic rise and fall of sea water under the gravitational influence of the moon and the sun. It rises and falls twice a day. Spring tides are formed during the synodic period when the sun, earth, and moon are aligned in a straight line. Neap tides are formed when the moon, earth, and sun are at right angles to each other. There are two spring tides and two neap tides each month. When the tide rises, the tide rises in the sea facing the moon and in the sea facing away from the moon, not the global tide rises at the same time.

Answer B

In the North Pacific Ocean, the "Pacific Garbage Continent" (see the picture below) formed by the accumulation of human-generated plastic waste that is difficult to biodegrade is floating here and its area is expanding. Complete questions 3~4 accordingly.

3. Which of the following narratives about the formation of the “Pacific Garbage Continent” is the least credible ()

A. Located inside the ocean circulation system centered on the subtropics in the North Pacific

B. Mainly located in the subtropical windless zone, floating objects are not easy to spread

C. The floating objects that make up the "Pacific Garbage Continent" mainly come from Asia and North America.

D. Downwelling plays a dominant role in the formation of the “Pacific Garbage Continent”

4. If there is a large-scale fishing ground in sea area A, use a schematic diagram of the ocean current profile to explain its cause, which should be ()

Analyzing question 3, the formation of the "Pacific Garbage Continent" is mainly caused by the accumulation of garbage brought by ocean currents. Question 4: The fishing ground here should be caused by the upwelling caused by offshore wind.

Answer 3.D　4.B

Keywords: PPT courseware for high school geography required by the People's Education Press is available for free download, seawater movement PPT download, water on earth PPT download, .PPT format;

For more information about the PPT courseware "Water on Earth: The Movement of Seawater", please click on the "Water on Earth ppt Movement of Seawater ppt" tag.

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Update Time: 2024-09-09

This template belongs to Geography courseware People's Education Press High School Geography Compulsory Course 1 industry PPT template

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