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"Explanation of Polar Day and Polar Night" Earth's Movement PPT Download
Part One: Exploring New Knowledge
Extreme day and extreme night phenomena
The phenomenon of polar day and polar night is the result of the tilt of the earth's axis causing sunlight to hit the polar regions at different times. So people in the polar regions can see the sun not setting in the sky for a period of time, or they can't see the sun for a period of time.
Polar day is a phenomenon that occurs within the polar circle where "the sun never sets", so it is also called "eternal day".
Polar night, also known as "eternal night", is a phenomenon in the polar regions of the earth where the sun is below the horizon during a day, that is, the night is longer than 24 hours.
Note: Observe if students rotate the globe to the other side of the flashlight and the earth's axis remains tilted.
The tilt of the globe remains unchanged and the direction of the cardboard is rotated to represent the rotation of the earth around the sun. When the cardboard is rotated 180 degrees vertically, it means that the earth has rotated to the other side of the sun. At this time, you can see that the Antarctic is in polar day.
Explanation of polar day and polar night PPT, part 2: expansion and extension
Do extreme day and night affect animals? During the polar day, animals must accumulate enough energy, keep eating, and raise their offspring efficiently, so that when the polar night comes, except for some animals that migrate to the south, those animals that remain can survive. Through the most difficult period.
Polar day and night phenomena occur at both poles of the earth, but they occur at exactly the opposite time. If the North Pole is in polar day, then the Antarctic is in polar night, and vice versa.
PPT explaining polar day and polar night, part 3: training for this lesson
1. Fill in the blanks
1. ( ) is a natural phenomenon that occurs in the polar regions of the earth.
2. The phenomena of polar day and polar night appear at exactly ( ). If the North Pole is ( ), then the South Pole is ( ), and vice versa.
3. The earth is a ( ).
2. Judgment questions
1. People in the polar regions can see the sun not setting in the sky for a period of time, or they cannot see the sun for a period of time. ( )
2. There will be major changes in climate, temperature, sunshine hours, etc., which will greatly affect life on the earth. ( )
3. Extreme daylight means that the sun cannot be seen for a long time and it is always dark. ( )
Explanation of polar day and polar night PPT, part 4 content: homework
In the process of understanding the movement of the earth, what natural phenomena do you know?
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