Radio waves can travel from one place to another through which mode(s) of propag

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1. Radio waves can travel from one place to another through which mode(s) of propagation?

Only ground wave propagation

Only sky wave propagation

Only space wave propagation

Ground wave, sky wave, and space wave propagation, all of them

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Depending on frequency and distance, radio signals can travel by hugging the ground, bouncing off the ionosphere, or travelling in a roughly straight line — all genuine propagation modes.