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How the Earth Was Made: America's Gold

44 minutes 41 seconds

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As shown on the History Channel. Gold dates from the time of the supernova explosion that gave birth to the building blocks of our solar system. When it was created, the Earth included a tiny percentage of gold atoms, and over the aeons geologic processes have concentrated it into various nooks and crannies around the globe. The best of it is in the ancient Precambrian rocks in South Africa, where the deepest mines in the world extract it. In other regions of the world, gold can be gathered from younger sedimentary rocks that have been eroded off older Precambrian rocks. The American gold rush was this type of deposit. Now in Nevada, sedimentary rocks are leached on a truly vast scale to extract the gold.

Media Details

Runtime: 44 minutes 41 seconds

Steeply sloping walls of layered, red sedimentary rock. Caption: the Grand Canyon remains the most famous of them all.
How the Earth Was Made
Season 2 / Ep 1
44 minutes 1 seconds
Grade Level: 9 - 12
A volcano emits ash and smoke, as seen from a city street. Caption: (narrator) It's the nightmare scenario that everyone fears.
How the Earth Was Made
Season 2 / Ep 2
44 minutes 1 seconds
Grade Level: 9 - 12
Molten, glowing sphere being pelted by rocks. Caption: was the fledgling Earth.
How the Earth Was Made
Season 2 / Ep 3
44 minutes 3 seconds
Grade Level: 9 - 12
Sand dunes. Caption: The wind that builds them also blows them away,
How the Earth Was Made
Season 2 / Ep 4
44 minutes 51 seconds
Grade Level: 9 - 12
A rocky sheer cliff with a river cascading down the face of it, as seen from above. Caption: is shaping this magnificent landscape.
How the Earth Was Made
Season 2 / Ep 5
44 minutes 21 seconds
Grade Level: 9 - 12
Illustration of a plate of Earth's crust being pushed beneath a second plate. Caption: (narrator) As the two plates moved towards each other,
How the Earth Was Made
Season 2 / Ep 6
44 minutes 1 seconds
Grade Level: 9 - 12
Lava shooting into the air. Caption: pouring out of volcanoes all around the Ring of Fire.
How the Earth Was Made
Season 2 / Ep 7
44 minutes 1 seconds
Grade Level: 9 - 12
Tall, snowy, and rocky mountain as seen from below. Caption: Is Everest shrinking or growing?
How the Earth Was Made
Season 2 / Ep 8
44 minutes 1 seconds
Grade Level: 9 - 12
Several volcanoes oozing lava and emitting smoke. Caption: They were pushed back by these mountains of fire.
How the Earth Was Made
Season 2 / Ep 9
44 minutes 1 seconds
Grade Level: 9 - 12
Lava field in foreground with evergreen trees and snowy mountain in background. Caption: Southwest of St. Helens, he investigates an area
How the Earth Was Made
Season 2 / Ep 10
44 minutes 50 seconds
Grade Level: 9 - 12