The National Geographic Magazine, Volume 202National Geographic Society., 2002 - Geography |
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Page 10
... half - life the less intense the radia- tion . Slightly radioactive uranium is no health threat if handled properly . After ten half - lives , an element is usually harmless . Scientists quantify radiation received by people with a unit ...
... half - life the less intense the radia- tion . Slightly radioactive uranium is no health threat if handled properly . After ten half - lives , an element is usually harmless . Scientists quantify radiation received by people with a unit ...
Page 92
... half feet wide . Ballast tank Deadlight Keel ballast release Flywheel Crankshaft PROPULSION The Hunley's power plant consisted of a crankshaft turned by seven men and linked to the propeller by a chain . A large flywheel increased ...
... half feet wide . Ballast tank Deadlight Keel ballast release Flywheel Crankshaft PROPULSION The Hunley's power plant consisted of a crankshaft turned by seven men and linked to the propeller by a chain . A large flywheel increased ...
Page 10
... half a million each year . But the unregulated use of so much ground- water has come at a high price : With farmers extracting water more quickly than nature can replenish it , aquifers have been depleted to the point that roughly half ...
... half a million each year . But the unregulated use of so much ground- water has come at a high price : With farmers extracting water more quickly than nature can replenish it , aquifers have been depleted to the point that roughly half ...
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