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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.
Publisher
A & E Television Networks
Pub. Date
[2007]
Physical Desc
4 DVDs (approximately 705 min.) : sound, color ; 4 3/4 in.
Language
English
Description
Disc 1: Tour the surface of Earth's life-giving star. Mars may be the future of humanity - uses data collected from probes and robotic rovers. Scars on the planet's surface and in its fossil record illustrate the threat posed by meteorites, comets, and asteroids that routinely collide with Earth. Two and a half times the size of all the other planets in the solar system combined, and half a billion miles from Earth, Jupiter is a colossal riddle.
Disc...
Publisher
Gale, a Cengage Company
Pub. Date
[2021]
Edition
Sixth edition.
Physical Desc
1 online resource (9 volumes) : illustrations (chiefly color)
Language
English
Description
Covers all major areas of science, engineering, technology, as well as mathematics and the medical and health sciences, while providing a comprehensive overview of current scientific knowledge and technology. Entries typically describe scientific concepts, provide overviews of scientific areas and, in some cases, define terms.
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