If the question is in what sentence do you see a predicate adjective, then the correct answer is in the first one - Not all deserts are sweltering, where the word <em>sweltering </em>is a predicate adjective.
A predicate adjective is an adjective that can be found following a verb.
Wind is often used for directional and navigational purposes, so this could mean that the author followed something by the wind whether it be how high or low the air- pressure is or which way the wind is blowing. Aswell as the fact that Wind is a major factor in weather determination. For example, if the wind blows ina counter- clockwise direction, then the air pressure is low which means that the weather is or will be bad like rain or storms.
Hope this helps!
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