Science Channel - Fearless Planet

Season 1

The history of the Grand Canyon.

Biologists study the Great Barrier Reef.

More than 4 billion years ago, a planet the size of Mars collided with Earth and set off a series of chain reactions that transformed the Earth from a lifeless wasteland into a fertile planet.

Dry river beds beneath the Sahara suggest the arid region was once a lush savanna.

The world's greatest light show illuminates the skies of Alaska.

The violent birth of the Hawaiian Islands.