Product Description

Scientists confront on an astounding possibility: that a single ancient cataclysmic volcanic eruption 75,000 years ago blasted ash and rock across an entire continent, spewing so much sulfuric acid into the atmosphere that Earth was plunged into a global

Product Details

• Amazon Sales Rank: #64933 in DVD
• Brand: WGBH BOSTON VIDEO
• Released on: 2007-01-16
• Rating: NR (Not Rated)
• Aspect ratio: 1.78:1
• Formats: Closed-captioned, Color, DVD, NTSC
• Original language: English
• Number of discs: 1
• Dimensions: .20 pounds
• Running time: 56 minutes

Customer Reviews

Informative and easy to watch
I've been buying Nova documentaries so my 7-year old son can get some science in his head in addition to the complete list of Transformers and the details of their fates.

This DVD does that job admirably; he watched it quite closely, and after we watched it, it was clear that he understood the material and was enthused about it. He wasn't so enthused about living in a state adjacent to Yellowstone NP, but you can't have everything!

For adults, the material is still compelling, since you'll pick up more than a few interesting details of volcanic geology, how they match volcanic ash to a volano, and lest I forget, that Yellowstone's only 40k years overdue for the most destructive eruption ever.

For adults there's still a few "hmm" moments. For instance, matching ash from remote deposits back to the original "super volcano" plays a major role in the investigation portrayed by the documentary.

However, while there are several excellent scenes when not-matching samples are displayed against each other, when the matching samples are displayed, it's just two photos of the same sample. Ooh, boo, since I was really interested in seeing how an ash sample from many hundreds of miles away matches what they found in the crater. Would it be a match that's obvious to the uninitiated, or is it more like a fingerprint, where you have to know what to look for?

But that's a nit relative to the overall production, which is more than well enough done and met my goals perfectly.

awsome power
this film is a must for everyone to see as it showes you how insucure we are our lives can be changed in such a short time