IONOSPHERE

noun
15 Scrabble
16 WWF
I 1
O 1
N 1
O 1
S 1
P 3
H 4
E 1
R 1
E 1

Definition

The part of the Earth's atmosphere beginning at an altitude of about 50 kilometers (31 miles) and extending outward 500 kilometers (310 miles) or more.

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