Three Rocks

Three Rocks

Video Cassette - 2003
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This show looks at three stones--a piece of igneous, a piece of sedimentary, and a piece of metamorphic rock-and investigates how they formed, and how they relate to one another throught the rock cycle. The show begins billions of years in the past when Earth was a burning-hot gooey ball of melted and metals called magna, and explains how a crust of rock cooled on the surface. The show then follows the process of weathering (mechanical, chemical, and biological), and explains how heat and pressure can metamorphose rock into yet another form.
Publisher: [Place of publication not identified] : United Learning ; Mississauga, Ont. : Distributed by Marlin Motion Pictures, c2003.
Characteristics: 1 videocassette (VHS) (approximately 12 min.) :,sound color ;,1/2 in.

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