You know what it looks like… but what is it called?
TAKE THE QUIZ“F2”
We have one entry that includes the term F2.
F2 layer
noun: the upper of the two layers into which the F region of the ionosphere splits in the daytime at varying heights from about 120 miles (200 kilometers) to more than 300 miles (500 kilometers) above the earth
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- Which of these items is named for a deadly weapon?
You can make only 12 words. Pick the best ones!
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Merriam-Webster unabridged