Final answer:
Flash floods are quick and intense localized events, often unpredictable, while regional floods cover larger areas and last for a longer period of time. The correct answer is c&d
Step-by-step explanation:
Flash floods and regional floods are different types of flooding events with distinct characteristics. Flash floods typically occur with little warning, are highly intense and quick, usually caused by heavy rainfall over a short duration in a localized area.
They may also be caused by dam or levee breaks. Regional floods, on the other hand, cover a much larger area and can result from prolonged rainfalls or the melting of snow. They often last for a longer duration compared to flash floods.
Therefore, the correct answers to how flash floods and regional floods differ are:
C) Regional floods cover larger areas.
D) Regional floods have longer durations.