The National Geographic Magazine, Volume 94National Geographic Society, 1948 - Geography Indexes kept up to date with supplements. |
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Page 280
... miles . Thus it should not be necessary to pass directly over the top of a mountain to find it . Its presence can be detected and the direction to the summit learned within a radius of 20 miles . " Great Plain " Crossed for 22 Days ...
... miles . Thus it should not be necessary to pass directly over the top of a mountain to find it . Its presence can be detected and the direction to the summit learned within a radius of 20 miles . " Great Plain " Crossed for 22 Days ...
Page 281
... miles showed rocky bottom but no life . 300 STATUTE MILES New - found Undersea Mountains Yielded Telltale Rocks and Sediments Exploring the Mid - Atlantic Ridge " Here in the. Mid - Atlantic Ridge dis- covered in 1873 by survey ship ...
... miles showed rocky bottom but no life . 300 STATUTE MILES New - found Undersea Mountains Yielded Telltale Rocks and Sediments Exploring the Mid - Atlantic Ridge " Here in the. Mid - Atlantic Ridge dis- covered in 1873 by survey ship ...
Page 291
... miles ) pro- duced a wonderful haul - some 400 pounds of rock and clay . The clay was not a typical ocean - bottom deposit but contained many angular fragments , probably pulverized mate- rial resulting from the slipping of great rock ...
... miles ) pro- duced a wonderful haul - some 400 pounds of rock and clay . The clay was not a typical ocean - bottom deposit but contained many angular fragments , probably pulverized mate- rial resulting from the slipping of great rock ...
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