Read the following passage and answer if the question is true or false.
Passage: Radio waves in vacuum travel at the speed of light. When passing through a material medium, they are slowed according to that object's permeability and permittivity. Air is thin enough that in the Earth's atmosphere radio waves travel very close to the speed of light.

Question: do radio waves penetrate the earth's atmosphere?

Is the answer True or False? Respond with only "True" or "False" and no additional text.
True
True. Radio waves do penetrate the Earth's atmosphere.