Final answer:
The aurora borealis is caused by interactions in the ionosphere of the thermosphere due to solar wind particles, resulting in a stunning natural light display.
Explanation:
The aurora borealis is caused by interactions in the ionosphere, a region in the Earth's thermosphere. The phenomenon occurs when charged particles from the solar wind react with ions and electrons in the ionosphere, creating the beautiful display of light known as the aurora borealis.
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