The Rio Grande Rift in New Mexico is a failed rift in North America, a rift that did not complete the separation of North America and the growth of a new sea between the two sides. Continue Reading
My choice of the most dangerous volcano of the world:
I have to agree with quite a few people. The most dangerous one is one which has been dormant for a long period of time and suddenly starts to wake up. Even more so if this sleeping giant lies in a densely populated area. Areas around volcanoes are often inhabited by large crowds of people.