one is caused by a massively destructive force, the other is a slower, less destructive process.
Step-by-step explanation:
Volcanic vents are openings in the crust, usually within the crater of a volcano, where magma (molten rock) and volcanic gases escape from the volcano's interior.
A crater is caused by an impact (such as a meteor crater) or an explosion, such as the crater atop Mt. St. Helen's.