Physics
The force that generates wind is

Pressure gradient force
Coriolis force
Gravity force
Centrifugal force

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Physics
A standing wave occurs when

The amplitude of a wave exceeds its wavelength
A wave reflects upon itself
Two waves overlap
The speed of the wave is zero or near zero

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Physics
Superconductors are substances which

conduct electricity at high temperatures
offer no resistance to the flow of electricity
offer high resistance to the flow of current
conduct electricity at low temperature

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