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The History Channel released the original documentary film to Region 1 DVD through Warner Home Video on April 15, 2008, and to Blu-ray through A&E Home Video on May 26, 2009. [1] [2] The television series premiered on February 10, 2009. Each 45-minute episode focuses on different geologic features and processes of the Earth. The first season ...
Earth formed about 4.54 billion years ago by accretion from the solar nebula, a disk-shaped mass of dust and gas left over from the formation of the Sun, which also created the rest of the Solar System. Initially, Earth was molten due to extreme volcanism and frequent collisions with other bodies.
The first eon in Earth's history, the Hadean, begins with the Earth's formation and is followed by the Archean eon at 3.8 Ga. [2]: 145 The oldest rocks found on Earth date to about 4.0 Ga, and the oldest detrital zircon crystals in rocks to about 4.4 Ga, [34] [35] [36] soon after the formation of the Earth's crust and the Earth itself.
Topics include the formation of the Solar System, the Earth, and the Moon; the formation of impact craters and how study of the Moon's surface helps us understand the early history of the Earth; the surface of Venus as it appears beneath the planet's acid rain clouds and what it tells us about the early Earth before the beginning of plate ...
Several unanswered questions remain, including whether Earth was a full "snowball" or a "slushball" with a thin equatorial band of open (or seasonally open) water. The Snowball Earth episodes are proposed to have occurred before the sudden radiations of multicellular bioforms known as the Avalon and Cambrian explosions ; the most recent ...
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Eyewitness, like most other shows of its kind, is a documentary series. Each half-hour episode focuses on a single subject in the field of natural science, such as the Solar System or the various functions of the human body, similar in form to the book series on which it was based, with most being based, in part or in whole, off of existing book titles at the time, with few exceptions (though ...
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