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Exploring the Mariana Trench reveals the slash along the floor of the Pacific Ocean to be deeper than Mount Everest is high.

The virtually rainless Atacama Desert nestled along Chile's Pacific coast west of the Andes is considered the driest place on Earth; bacteria found in the Atacama gives scientists hope they might find life on Mars.

A massive volcanic eruption in Siberia kills 95 percent of the species on Earth 250 million years ago, paving the way for the age of the dinosaurs.

The Mount St. Helens volcano in Washington state erupts in 1980, killing 57 people; studying the volcano's geology while wondering when it will explode again.

An eruption of Italy's Mount Vesuvius destroyed the ancient Roman cities of Pompeii and Herculaneum, and the volcano continues to threaten a densely populated area of 3 million people.

Exploring the underground forces that triggered one of recorded history's biggest volcanic eruptions at Krakatoa, killing more than 36,000 people and causing widespread destruction in 1883.

As the Earth's average temperature rises each year, experts warn we are nearing a fatal tipping point that will set into motion a cascade of natural disasters that will devastate the United States and the world.