Environmentalist's concern (10 letters) — Crossword Helper

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The Clue

Environmentalist's concern (10 letter answer)

The Answer

IONOSPHERE

Tags

concern environmentalist ionosphere light northern occur radio reflect reflector wave where

Notes

The answer IONOSPHERE is so rare that it appears less than once every 2500 puzzles.

Related Clues

Radio wave reflector
It reflects radio waves
Where the Northern Lights occur

Definition

IONOSPHERE as a noun:

1. the outer region of the Earth's atmosphere; contains a high concentration of free electrons