2 Movement of the Earth Unit 1 About the Earth
1 Why is there day and night? 1. Day and night repeat on a regular basis. Why? Make a guess.
2. The Earth rotates on its axis, which is an imaginary line passing through the North Pole and the South Pole. Shine a torch on a globe to simulate how the Sun shines on the rotating Earth. Then, explain why there is day and night.
1
paper puppet
Hong Kong
Earth’s axis
Use some tape to fix the paper puppet at the location of Hong Kong on the globe. Shine the torch on that spot.
2
3
Without moving the torch, rotate the globe anticlockwise for a half turn.
Rotate the globe anticlockwise for another half turn.
Explanation: It is bright / dark in Hong Kong when it faces the Sun, so it is
day / night . When the globe rotates for a half turn, Hong Kong turns away from the Sun. It is bright / dark there, so it is day / night .
Quick Check
The cycle of day and night is caused by the
of the Earth.
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