Secrets of the Earth • 2013 • 8 episodes • 3h:09m

"Secrets of the Earth" explores our planet with the same sense of awe and wonder normally reserved for alien worlds. Computer graphics, visual analogies and expert scientists combine to reveal amazing, little-known aspects of the world, from canyons of gravity that warp space and time to rain triggered by cosmic rays.

Rain

Scientists are just now unlocking the amazing secrets of how rain is made; some raindrops form around micrometeorites from outer space, others are created by bacteria that float into the upper atmosphere.

2013 • Environment

Tsunamis

Which places on earth are poised to generate the next mega-tsunamis and the science of what happens as the wave emerges from open ocean and bears down on land.

2013 • Environment

Tides

Explore what drives the strange science behind places like Canada's Bay of Fundy-where water levels rise as much as 50 feet during high tide, and Alaska's Turnagain Arm, where 10-foot tall "bore waves" routinely wash in from the sea.

2013 • Environment

Volcanoes

Volcanoes have incredible effects on the weather; eruptions create localized weather phenomena like acid rain and violent volcanic lightning.

2013 • Environment

Gravity

NASA satellites have mapped Earth's gravity and discovered mysterious spots where gravity is weaker; how earthquakes change the planet's gravitational field.

2013 • Environment

Goldilocks

Venus and Mars show how inhospitable Earth could have been if things were just a little bit different.

2013 • Environment

Magnetic Shield

Earth's metallic core makes the planet a huge magnet, generating a magnetic field that protects us from dangerous cosmic rays and solar energy.

2013 • Environment

Blizzards

Blizzards; it's one of the Earth's most beautiful secrets until it turns into a storm that can bring entire cities to a grinding halt.

2013 • Environment