How do rainbows form?
Rainbows form when sunlight is refracted, reflected inside, and refracted again by water droplets, splitting it into colours seen only from the right position.
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Science
Weather
Why is it colder on a mountaintop if it's closer to the Sun?
The Sun is so far away that a mountain's height changes nothing. Thinner air at altitude holds less heat and expands and cools, so temperature falls as you climb.
Starter thread · AI-reviewed against its sources