Yes.
Yes.
With some exceptions, volcanoes are generally not dangerous to people. Your chance of being killed by a volcano is 1 in 80000 over your lifetime, which is far less than your chance of being killed in say a motor vehicle accident (1 in 67). There are also two classifications for inactive volcano's. Volcanoes which have not erupted for a significant amount of time are known as dormant volcanoes. Volcanoes which have not erupted in human history are known as extinct volcanoes. Extinct volcanoes are never expected to erupt again, and are therefore not dangerous unless they have been misclassified. So no, I do not think that all volcanoes whether active or inactive are dangerous. The only dangerous volcanoes are dormant volcanoes that explode suddenly with little or no warning.
No. Only a handful of Hawaii's volcanoes are active.
Most volcanoes are not active but some are. It is very rare for a volcano to be active. :-)
I think any volcano is potentially dangerous. It was once thought that volcanoes were extinct but now scientist think volcanoes are active or dormant. So any volcanoe could erupt and be dangerous. Some are more likely to than others.
It definitely has dangerous aspects, as it formed many active volcanoes and earthquakes zones.
No, not all jovian planets have active volcanoes. For example, Jupiter and Saturn do not have active volcanoes. However, some of the moons that orbit these planets, such as Io (a moon of Jupiter), do have active volcanoes.
There is currently no evidence to suggest that Mars has active volcanoes. However, many of its volcanoes are considered extinct, with evidence of past activity visible on the surface.
No. they are all extinct. The extinct volcanoes are: Ostrzyca, Grodczyn, and Wilcza Góra.
active volcanoes erupt but not all the time, there are 3 different types of volcanoes active, inactive and extinct.
no in 1902 a man named charles william said all volcanoes are all dangerous
it has volcanoes, but none are active