: An eruption could be large enough to plunge the entire planet into a "volcanic winter".
: A massive fault line 80 miles off the Pacific Northwest coast. X-Ray Earth
X-Ray Earth - National Geographic for everyone in everywhere : An eruption could be large enough to
: Scientists explore the potential for a massive landslide that could send a killer tsunami across the ocean toward the U.S. East Coast. Episode 3: Volcano Apocalypse X-Ray Earth
: The massive volcano system beneath Yellowstone National Park .