Challenging puzzle for experienced crossword solvers
Simple Ionosphere Explorer Terms
Perfect for beginners with simple, common vocabulary
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2
3
4
5
Across
- 1. Area beyond Earth’s atmosphere
- 3. Soft light seen in the upper atmosphere
Down
- 2. Device that sends or receives signals through the air
- 4. A level or part of the ionosphere
- 5. Energy that travels through the air or space
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