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Radon is a noble gas. In general gases are considered thin/low viscosity.
A thin atmosphere is thin and a thick atmosphere is thick
The pair word is 'thin': thick and thin.
Pluto is likely to have a frozen atmosphere due to its distance from the sun, resulting in extremely low temperatures that can freeze gases like nitrogen and methane in its thin atmosphere.
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Permafrost means a thin layer of frozen soilPerma-frost is the thick sub-surface layer of soil that remains frozen all year long. This happens mostly in the polar regions.
A thin cuticle refers to a plant's outer protective layer that is relatively thin, allowing for easier gas exchange and nutrient absorption. In contrast, a thick cuticle is a heavier, more protective layer that can reduce water loss but also limit the exchange of gases and nutrients with the environment.
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