Are volcanoes always mountains?

The best answer I can give to this question is that eventually, every volcano does erupt from a mountain. However, there are plenty of volcanoes around the world that are not currently mountains. The best technical definition is “a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gases are being or have been erupted from the earth’s crust” from Google’s dictionary function.

So, it could be a hill or a mountain, but they must have a vent or crater for lava and other things to flow to the surface.

That is the crucial part of the definition. As the previous answer states, all volcanoes start as a vent or a crater. The debris is what creates the mountain around a volcano.

No. This is a misconception commonly held. Although volcanoes typically erupt from mountains, they can erupt from any vent in the ground. However, the mass they throw up does or will ultimately form a mountain. Even so, the existing volcanic mountains, such as Krakatoa, has a crust that breaks and allows lava, ash, and hot gases to flow or be ejected - a very scary event if you live nearby.

In the 19th century, this volcano on the Indonesian island of Krakatoa erupted with 13,000 times the power of an atomic bomb. The sound of the spewing smoke and rock was reportedly heard thousands of miles away,