Can you tell an equinox from a solstice?

The two equinoxes and two solstices mark the beginning of astronomical seasons. But what is the difference between an equinox and a solstice? And what's the reason the Earth has seasons at all? Take this quiz to get answers to these questions and learn fun facts about equinoxes and solstices.

Equinoxes & solstices quiz intro#2
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