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Earth's Rotation (turning or spinning on its axis) causes Day and Night.
One way to demonstrate this science concept is to use a globe to represent the Earth and a flashlight to represent the Sun. Demonstrate that if the Eastern Hemisphere is having day then the Western Hemisphere is having night.
1 Earth Rotation takes approximately 24 hours.
Vocabulary: rotate rotation, day, night, Earth, axis
Younger students can pretend that they are the Earth and "rotate" showing day and night.
Older students can draw a picture and EXPLAIN why half the Earth has day while the other half has night.