Here's why:

* Extinct: While "extinct" is sometimes used, it's not technically accurate. It implies the volcano will never erupt again. Volcanoes are complex, and predicting their future is challenging.

* Dormant: This term is more precise. It means the volcano is currently inactive but has the potential to erupt again in the future.

Other terms you might hear:

* Dead volcano: This term is used rarely and often in a less scientific context. It's best to avoid using it.

* Inactive volcano: This term is similar to dormant, but it doesn't necessarily imply the volcano has the potential to erupt again.

Ultimately, the best term to use depends on the specific context and the level of certainty about the volcano's future activity.