noun
the part of the Earth's atmosphere that contains a high concentration of ions and free electrons, and is able to reflect radio waves
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The ionosphere is a region of the Earth's upper atmosphere, from about 30 miles to 600 miles above the surface, containing a high concentration of ions.
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Scientists study the ionosphere to understand how it affects radio communications and GPS signals.
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I heard that the ionosphere can mess with your cell phone reception sometimes.
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Just like the ionosphere reflects radio waves, sometimes we need to reflect on our actions before making decisions.