The National Geographic Magazine, Volume 215, Issues 1-3National Geographic Society., 2008 - Geography |
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Results 1-3 of 34
Page 59
... electricity . Miners use pneumatic drills now with their hammers and chisels . Traditional leg - driven rock grinders have given way to small electric mills . Electricity hasn't made mining any cleaner ; if anything , mercury and other ...
... electricity . Miners use pneumatic drills now with their hammers and chisels . Traditional leg - driven rock grinders have given way to small electric mills . Electricity hasn't made mining any cleaner ; if anything , mercury and other ...
Page 67
... ELECTRICAL LOSS 3.6 RENEWABLE 11.1 PETROLEUM 41.0 ELECTRICITY USED IN THE HOME 40.0 NATURAL GAS If we converted half of ... electric edger , elec- tric leaf blower . Then it dawned on me : All this power - sucking equipment was going to ...
... ELECTRICAL LOSS 3.6 RENEWABLE 11.1 PETROLEUM 41.0 ELECTRICITY USED IN THE HOME 40.0 NATURAL GAS If we converted half of ... electric edger , elec- tric leaf blower . Then it dawned on me : All this power - sucking equipment was going to ...
Page 69
... electric train ( mainly from coal - fired power plants ) are spread among thousands of riders . ENERGY CONSERVATION 69 FREEZER : 1,397 | ELECTRIC HEAT PUMP : 5,249 |. YOU GET TO READ THE PAPER TOO DOING LESS HARM IN FLIGHT.
... electric train ( mainly from coal - fired power plants ) are spread among thousands of riders . ENERGY CONSERVATION 69 FREEZER : 1,397 | ELECTRIC HEAT PUMP : 5,249 |. YOU GET TO READ THE PAPER TOO DOING LESS HARM IN FLIGHT.
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