Which scientific term best matches this description: Region of Earth’s upper atmosphere containing abundant ions and free electrons mainly formed by ultraviolet light and X-rays from the Sun?

A) aurora

B) ionosphere

C) carbon dioxide

D) magnetic field

Answer: B

Explanation: A region of Earth's upper atmosphere containing abundant ions and free electrons mainly formed by ultraviolet light and X-rays from the Sun. The term is also used to describe corresponding regions above the surfaces of other planets.

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