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Qingdao Edition Fourth Grade Science Volume 2	pptx	6 MB

"Changing of Seasons" PPT

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Upload Time: 2024-11-21

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"Changing of Seasons" PPT

Part One: Group Activities

Based on your life experience and the knowledge you know, recall how various things change in different seasons?

(Take a thing as an example and talk about how it changes in different seasons)

scientific conjecture

Ask students to make guesses based on their own life experience and existing scientific knowledge: What do you think the change of seasons is related to?

While the earth rotates, it also orbits the sun, from west to east. During the Earth's revolution, the tilt angle of the Earth's axis is about 23.5 degrees, and the direction of the tilt remains unchanged. The northern end of the Earth's axis always points near the North Star. The earth's orbit is close to a perfect circle and an ellipse. It takes one year for the Earth to make one revolution.

Part 2 content: Knowledge sorting

Earth's revolution

1. The direction of the Earth’s revolution: from west to east

2. The Earth’s revolution period: about one year (365.2422 days)

3. The attitude of the earth’s revolution: tilted

4. Effects of Earth’s revolution: changes in seasons

Part Three: Simulation Experiment

Pay attention to observation: When the earth moves to different positions, is the amount of sunlight shining on the same position on the earth the same? How does it change?

The reason for the change of seasons

As the Earth orbits the Sun, its axis is always tilted, and the direction of tilt remains unchanged. Due to the tilt of the earth's axis, the degree of sunlight received by the northern and southern hemispheres also changes constantly when they are at different positions on the orbit, thus forming the change of seasons.

Outreach activities

Based on experience, the working people of ancient my country divided the four seasons into twenty-four solar terms and wrote solar terms songs.

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For more information about the "Changing of Four Seasons" PPT courseware, please click on the "Changing of Four Seasons" ppt tab.

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Update Time: 2024-11-21

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Change of seasons ppt

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"Changing of Seasons" PPT