Which of the following is true for all types of fronts (warm, cold, stationary, and occluded)?
a). rain falls
b). they are created by convection cells.
c). a land breeze can be created by any of them
d). a warm air mass is in contact with a cold air mass.

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Among the choices the one that is true for all types of fronts (warm,cold,stationary, and occluded) is letter D which is A warm air mass is in contact with a cold air mass.

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