"Why Are There Four Seasons on Earth" Sun, Earth and Moon System PPT Courseware 2

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"Why Are There Four Seasons on Earth" Sun, Earth and Moon System PPT Courseware 2

Autumn comes and summer goes, winter goes and spring comes back, year after year, the four seasons cycle forever. How does this cycle of cold and warm seasons come about?

If the sun is this big furnace and the person warming the fire is the earth, what conclusion would you draw?

The sun is far away from the earth and the temperature of the earth is low

The sun is closer to the earth and the earth’s temperature is higher

When the earth is close to the sun, its revolution speed speeds up, causing cold air to wander rapidly, which forms the two seasons of autumn and winter.

After the winter, after the earth moves away from the sun, its revolution speed will gradually slow down from fast, causing the air flow on the earth's surface to slow down, thus forming a warm current. This is spring and summer.

Observe the length of the shadow of the same object at the same place at the same time to guess what season it is?

think:

1. How should the globe be placed? Which direction does the Earth's axis point?

2. How long is the shadow? Is it the same as the ancient research?

3. Where is the direct point of the sun in different locations?

Simulation experiment:

Put a pole vertically on the globe, put a lamp as the sun, let the earth revolve around the sun, and measure the pole at four directions: A (spring equinox), B (summer solstice), C (autumn equinox), and D (eastern solstice). The length of the shadow.

1. Discussion: Can the results measured in the four directions A, B, C, and D determine the season of the earth?

1. Discussion: If the earth's axis is not tilted, can we still see such a phenomenon?

2. Discussion: What will happen to the sunlight exposure to the same place on the earth during the year? What are the differences in sunlight exposure in different areas of the earth? When it's summer in the Northern Hemisphere, what season is it in the Southern Hemisphere? If the earth's axis was not tilted, but vertical, would there be four seasons on the earth?

Conclusion: The formation of the four seasons is related to the revolution of the earth and the tilt of the earth's axis.

Why are there four seasons on Earth? Fill in our understanding...

1. Sunlight regularly shines directly or obliquely in different areas of the earth, and the length of the pole shadow is different, so there are different seasons;

2. Direct or oblique sunlight causes the temperature in different areas to change regularly, so there are different seasons;

3. The tilt of the earth's axis causes sunlight to regularly shine directly or obliquely on a certain area, so the temperature also changes regularly, forming four seasons.

The earth is a sphere. If the axis of the earth is vertical, then the sunlight will always shine directly on the equator. The areas of the day hemisphere (the half illuminated by the sun) and the night hemisphere (the side facing away from the sun) will be almost equal. The day and night time at any location It will be about the same length.

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"Why Are There Four Seasons on Earth?" Sun, Earth, and Moon System PPT Courseware:

"Why Are There Four Seasons on Earth?" Sun, Earth, and Moon System PPT Courseware. What may be related to the formation of the four seasons of the year? What should the ancients pay attention to when measuring the length of the shadow of a pole? The length of the pole remains the same and the place where it is inserted remains the same. Measure the shadow direction at the same time of the day..

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Update Time: 2024-11-20

This template belongs to science courseware People's Education Press Sixth Grade Science Volume 1 industry PPT template

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