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Author
Series
Practical Geology volume 21
Language
English
Description
The most highly prized rocks among non-geologists are gemstones. This episode covers all 12 birthstones, plus other gems, probing the shifting categories of precious and semi-precious gems. You learn how gems form and where to find them. Even more difficult to find are meteorites. Hear tips for identifying these extraterrestrial rocks, which are unlike anything native to Earth.
Author
Language
English
Description
Did an enormous collision in the Asteroid Belt, orbiting the sun between Mars and Jupiter, bombard Earth with meteorites 470 million years ago? Astonishing new research suggests it did, and a revolutionary theory is emerging that this bombardment resulted in the single greatest increase in biological diversity on the planet since the origin of life. Introducing these discoveries to the general public for the first time, Ted Nield challenges the view...
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