There is no reason to believe Yellowstone will erupt any time in the next century.
It didn't. The Yellowstone volcano last erupted about 70,000 years ago. The last super eruption was about 640,000 years ago.
because smoke comes out of the volcano
no
A tree fell down and touched the volcano so the volcano started erupting.
As often as it wants. It all depends on how much pressure is building up underneath it.
Any of the volcanoes around Portland and Seattle could blow at any time. In Alaska, volcanoes are erupting quite regularly. It is really difficult to tell which US volcano is likely to erupt, next. But . . . Mt. Rainier, in the Seattle area, is expected to erupt in our lifetimes, and the immense volcano in and under Yellowstone Park could erupt at any time. There are a couple of volcanos in northern California that could erupt, as well.
I consider an eruption in Yellowstone in 2012 VERY unlikely, mostly because it's now 2013.
Scientists do not know exactly when Yellowstone will erupt. Most likely in a few million years or so (estimate).
Yes. It erupted 3 time in the last 2.1 million years
It is extremely unlikely. Currently, there is no indication that something is developing.
No. The last eruption of the Yellowstone volcano was about 70,000 years ago. Its last super eruption was 640,000 years ago.
Yellowstone's last magma eruption was about 70,000 years ago. The last super eruption was approximately 640,000 years ago.