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

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People's Education Press Sixth Grade Science Volume 1	pptx	6 MB

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

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Upload Time: 2024-09-16

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

What might the formation of the four seasons of the year be related to?

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.

Take measurements at the same time of day (same direction of shadow)

The earth's axis is tilted and its direction remains unchanged

The pin side of the globe is facing the flashlight

The sun is slanting: the shadow is long

Direct sunlight: short shadow

I see

Long shadow—small illumination angle—weak light—low temperature—winter

Short shadow—large illumination angle—light intensity—high temperature—summer

Can you tell me the reasons for the four seasons?

During the Earth's revolution, due to the tilt of the Earth's axis, sunlight regularly shines directly or obliquely on a certain area, so the temperature also changes regularly, forming the four seasons.

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

"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, the person who warms the fire is the earth...

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Update Time: 2024-09-16

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