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Low frequency radio waves from space are blocked by Earth's:
ABiosphere
BIonosphere
CHydrosphere
DLithosphere
Answer & Solution
Correct answer: B. Ionosphere
1. A charged layer high in the air reflects long radio waves.
2. That layer has its own name.
3. It is the ionosphere.
_Source: OpenStax Astronomy 2e, Chapter 5, Radiation and Spectra._
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