Why is there a day and night on planet Earth? Select one:
Out of
a. The sun is hot in the morning, so it floats upwards, then cools off in the evening, so it sinks back downwards
b. The sun orbits around the Earth, causing day and night
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c. The gravity of the moon pulls the sun up during the day, and pushes it back down during the night
d. The Earth is spinning, and whichever side is pointed toward the sun experiences daytime
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