New PDF release: The Gale encyclopedia of science vol 1

By K Lee Lerner; Brenda Wilmoth Lerner

ISBN-10: 0787675547

ISBN-13: 9780787675547

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Abyssal plains are often littered with nodules of manganese containing varying amounts of iron, nickel, cobalt, and copper. These pea- to potato-sized nodules form by direct precipitation of minerals from the seawater onto a bone or rock fragment. Currently, deposits of manganese nodules are not being mined from the sea bed, but it is possible that they could be collected and used in the future. GALE ENCYCLOPEDIA OF SCIENCE 3 Of the 15 billion tons of river-carried clay, sand, and gravel that is washed into the oceans each year, only a fraction of this amount reaches the abyssal plains.

Symbolically, this means a = GALE ENCYCLOPEDIA OF SCIENCE 3 volts, although later improvements raised that value to 5,000,000 volts. See also Accelerators; Gravity and gravitation; Laws of motion; Velocity. The Van de Graaff accelerator can be converted to a particle accelerator by attaching a source of positively charged ions, such as protons or He+ ions, to the hollow dome. These ions feel an increasingly strong force of repulsion as positive charges accumulate on the dome. At some point, the ions are released from their source, and they travel away from the dome with high energy and at high velocities.

If local stresses are sufficiently great, failure of a tiny volume of abraded material will result, and a small particle will be detached. This type of abrasion occurs regardless of whether contact of the two surfaces is due to sliding, rolling, or impact. Some forms of abrasion involve little or no impact, but in others the energy of impact is a deciding factor in determining the effectiveness of the abrasive. Brittle materials, for example, tend to shatter when impacted, and their abrasion may resemble erosion more than fracture.

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The Gale encyclopedia of science vol 1 by K Lee Lerner; Brenda Wilmoth Lerner


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