Fog is most likely to appear over A. a warm pond B. a field in the late afternoon C. a cold ocean current D. a desert

The answer to the first one is barometer.

Explosive eruptions are the most hazardous, involving large volumes of tephra and gases emitted from the volcano. lahars, pyroclastic flows, ashfall, and many other volcanic hazards are commonly associated with explosive eruptions. explosive eruptions are very dangerous. basically, any form of hazard can occur.