Yellowstone's Supervolcano To Blow

Every 600 million years Yellowstone Park super volcano erupts, the last time this happened was 640million years ago. This could wipe out North America and damage life on earth beyond comprehension. It is a case of not if but when..... 

We do not know what causes earthquakes and volcano's to erupt, we understand the mechanics of these events but not the trigger. There are so many things to consider, from what happens in the earth to what is happening in our solar system.