History Channel - How the Earth Was Made Series 2 - BluRay (2010) Part 13 America's Gold
From the Big Bang to today, explore Earth's 4.5-billion-year history of unimaginable timescales, incredible life forms, radical climates, and mass extinctions. Spectacular on-location shooting, evidence from geologists in the field, and clear, dramatic graphics combine in Season Two of this stunning series from HISTORY to show how immensely powerful, and at times violent, forces of geology have formed our planet. This season, HOW THE EARTH WAS MADE goes back in history– from 4.5 billion years ago to today– peeling back layers of rock, filling up river canyons, parting the oceans, and levelling mountains and volcanoes to investigate the origins of some of the most well-known locations and geological phenomena in the world. With rocks as their clues and volcanoes, ice sheets and colliding continents as their suspects, scientists launch a forensic investigation that will help viewers visualize how the Earth has evolved and formed over millions of years. From a once seething, hellish mass of molten rock to the world that inhabits life today, take a rollercoaster ride through the entire history of Planet Earth. Its 4.5 billion year epic, a story of unimaginable timescales, earth-shattering forces, incredible life forms, radical climates and mass extinctions. Discover how the continents were formed, canyons were carved, and why the world's animals live where they do. The series examines some of the most well-known locations and geological phenomena in the world, including the Grand Canyon, Vesuvius, Sahara, the birth of the Earth, Yosemite, Death Valley, Everest, and the Pacific Ring of Fire. Using interviews with experts, geological evidence, and computer generated graphics, the series explains in an easy-to-understand way how those locations and geological phenomena have been shaped by the immensely powerful, and at times violent, forces of geology. Experience all 13 episodes of this landmark series for the first time on Blu-ray.
Part 13 America's Gold
The history of discovery of gold deposits in California and Nevada and the diverse geological processes are described. 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.
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