According to modern ideas, the first step in the origin of life was a. volcanic activity b. the formation of simple organic molecules c. the presence of oxygen in earth’s environment d. the evolution of autotrophic prokaryotes

Answer steam fog;

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.