History Channel - How the Earth Was Made Series 1 - BluRay (2009) Part 10 Asteroids

From a seething ocean of radioactive, molten rock to a refuge for life as we know it, Earth has undergone a staggering series of cataclysmic transformations in its long and epic history. Assailed relentlessly for millions of years by meteorites, our once toxic and hostile planet has been covered in water and in ice, and seen the rise and sundering of continents, the creation of an atmosphere, and, ultimately, the beginning of life. HOW THE EARTH WAS MADE plots the twisting course of Earth's amazing journey. Using groundbreaking special effects and traveling to remote locations where our planet still bears the scars of its violent history, this compelling documentary tells a story of unimaginable timescales, world-shattering forces, radical climates, and mass extinctions. HISTORY journeys back in time to show the creation of Earth s land masses, the birth of the first complex creatures, and devastating extinctions–before speculating on the future when all life becomes extinct. Spectacular on-location footage, evidence from geologists in the field, and clear, dramatic graphics combine in this stunning 13-part series from HISTORY to show how immensely powerful, and at times violent, forces of geology have formed our planet. Investigate with HISTORY the origins of some of the most well-known locations and geological phenomena in the world. From the Great Lakes to Iceland, the San Andreas Fault to Krakatoa, HOW THE EARTH WAS MADE travels the globe to reveal the physical processes that have shaped our planet. 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. Locations covered in “How the Earth Was Made” include Hawaii, a remote island chain brought to being by the movement of super heated magma deep within the earth, to the Marianas Trench, a spot in the sea deeper than Mount Everest is high, where the ocean floor disappears into the centre of the earth. Experience all 13 episodes of this landmark series for the first time on Blu-ray.

Part 10 Asteroids

Until recently geologists could find no evidence that asteroids had actually struck the earth. The history of asteroid studies started largely at Meteor Crater, a three-quarter mile wide, 550 foot deep bowl-shaped depression lying in the northern Arizona desert. In the late nineteenth century, geologist Grove Gilbert examined the crater, and initially proposed that it had formed from a meteor impact. The original body was a mass of iron weighing 300,000 tons which entered the atmosphere with a speed of 35 times that of sound! The resulting impact energy that created the crater was likely the equivalent of many thousands of nuclear bombs. Another ancient impact site is found at Sudbury in Canada. At 155 miles in diameter, Sudbury is earth's second largest suspected impact site. It formed nearly 2 billion years ago from an immense impact. See both the immense riches now known to be the result of these giant boulders from space, and the decimation their violent impacts had on the first people to live in America.

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