What is the difference between an active, dormant, and extinct volcano ?

A dormant volcano is a volcano that hasn't erupted in a couple thousand years, but is still set to erupt again at some point

An active volcano is any volcano that has erupted in the past 10,000 years

An extinct volcano is a volcano that hasn't erupted in over 10,000 years

d.) circle motion requires a force to give it a centripetal acceleration.