geology

NATURE
Yosemite

 

Yosemite Valley is a land forged in wildfire and sculpted by water, and the delicate balance of these two elements is essential to the creatures and trees that call this land their home. But with climates changing and temperatures rising, the Sierras are under siege. Water is scarcer and the threat of fire is more common. Join scientists and adventurers as they trudge through mountains of snow, climb trees as tall as buildings and soar high in the air to spy just how these global changes are affecting one of America’s greatest wildernesses.

 

NOVA
Treasures of the Earth: Gems

 

Gemstones like diamonds, rubies, opal and jade are some of Earth’s ultimate treasures. Delve into the depths to discover how these precious stones are forged and what explains the unique allure of each captivating gemstone.

 

NOVA
Sinkholes: Buried Alive

 

In Tampa, Florida, in February 2013, a giant hole opened up under the bedroom floor of Jeffrey Bush, swallowing the 36-year-old as he slept. His body was never found. Bush was a victim of a sinkhole – a growing worldwide hazard that lurks wherever limestone and other water-soluble rocks underpin the soil. When carbon dioxide in the air dissolves in rainwater, it forms a weak acid that attacks the soft rocks, riddling them with holes. Sinkholes can occur gradually when the surface subsides into bowl-shaped depressions or suddenly, when the ground gives way – often catastrophically.

 

NOVA
Killer Landslides

 

In less than two minutes in March of this year, a one-square-mile field of debris slammed into the Washington state community of Oso, killing 41 and destroying nearly 50 homes. Drawing on analyses of other recent landslides around the world, geologists are investigating what triggered the deadliest U.S. landslide in decades and whether climate change is increasing the risk of similar disasters around the globe.

 

NOVA
Making North America: Life

 

Mighty, elemental forces molded North America – fiery eruptions, titanic floods, the grinding of great ice sheets and massive impacts from space all shaped our homeland. The epic three-part series unfolds in a forgotten world that existed long before our own, crossed by long-lost mountain ranges, deserts the size of Africa and vast inland seas spanning the length of the continent. Hosted by renowned paleontologist Kirk Johnson, this spectacular road trip through a tumultuous deep past explores three fundamental questions: How was the continent built? How did life evolve here? And how has the continent shaped us?

 

Making North America: Life
Discover the surprising intertwined story of life and landscape in North America – from origins to iconic dinosaurs to giant marine reptiles swimming in an ancient sea that once split the continent in two.

 

NOVA
Making North America: Origins

 

Mighty, elemental forces molded North America – fiery eruptions, titanic floods, the grinding of great ice sheets and massive impacts from space all shaped our homeland. The epic three-part series unfolds in a forgotten world that existed long before our own, crossed by long-lost mountain ranges, deserts the size of Africa and vast inland seas spanning the length of the continent. Hosted by renowned paleontologist Kirk Johnson, this spectacular road trip through a tumultuous deep past explores three fundamental questions: How was the continent built? How did life evolve here? And how has the continent shaped us?

 

Making North America: Origins
See the epic 3-billion-year story of how our continent came to be. From palm trees that once flourished in Alaska to huge eruptions that nearly tore the Midwest in two, discover how forces of almost unimaginable power gave birth to North America.

 

NOVA
Bigger Than T.rex

 

Almost a century ago, paleontologists found the first tantalizing hints of a monster even bigger than Tyrannosaurus rex, perhaps the largest predator ever to walk the Earth: spectacular fossil bones from a dinosaur dubbed Spinosaurus. But the fossils were completely destroyed during a World War II Allied bombing raid, leaving only drawings, lots of questions, and a mystery: What was Spinosaurus? Now, the discovery of new bones in a Moroccan cliff face is reopening the investigation into this epic beast. What did it feed on and how? Why did it grow so big?

 

We follow the paleontologists who are reconstructing this terrifying carnivore piece by piece, revealing a 53-foot-long behemoth with a huge dorsal sail, enormous, scimitar-like claws and massive jaws, tapered toward the front like a crocodile, hosting an army of teeth. Bringing together experts in paleontology, geology, climatology and paleobotany, this NOVA/National Geographic special brings to life the lost world over which Spinosaurus reigned more than 65 million years ago.

 

NOVA
Sinkhole: Buried Alive

 

In Tampa, Florida, in February 2013, a giant hole opened up under the bedroom floor of Jeffrey Bush, swallowing the 36-year-old as he slept. His body was never found. Bush was a victim of a sinkhole – a growing worldwide hazard that lurks wherever limestone and other water-soluble rocks underpin the soil. When carbon dioxide in the air dissolves in rainwater, it forms a weak acid that attacks the soft rocks, riddling them with holes like Swiss cheese. Sinkholes can occur gradually when the surface subsides into bowl-shaped depressions or suddenly, when the ground gives way – often catastrophically. Sinkholes have swallowed highways, apartment buildings, horses, camels, even golfers, with monster-size holes cracking the earth from Siberia to Louisiana. With compelling eyewitness video of dramatic collapses, NOVA follows scientists as they explore the underlying forces behind these natural disasters, traveling the globe to investigate what it’s like to have your world vanish beneath your feet.

 

 

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