Physics
Middle latitude cyclones are fueled by?

Energy from falling precipitation
Polar continental air masses
All of these
Air high in the atmosphere

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.
Short waves are unaffected by atmospheric disturbances.
Short wave broadcasts are made by nearby radio stations.
Short waves are more energetic than long waves.

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