The National Geographic Magazine, Volume 101National Geographic Society, 1952 - Geography Indexes kept up to date with supplements. |
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Page 68
... rocks above . If the core were rock , the earth would weigh less than it actually does . But if the core is assumed to be iron , the weight comes out about right . Earth's Inside Story Bore into bedrock on any of the continents and you ...
... rocks above . If the core were rock , the earth would weigh less than it actually does . But if the core is assumed to be iron , the weight comes out about right . Earth's Inside Story Bore into bedrock on any of the continents and you ...
Page 68
... rocks below . When a rock mass is strained beyond endurance , it breaks or slips . The resulting jar is an earthquake . Most of these fractures and slippages are 10 to 30 miles deep , but a few have occurred as far down as 400 miles ...
... rocks below . When a rock mass is strained beyond endurance , it breaks or slips . The resulting jar is an earthquake . Most of these fractures and slippages are 10 to 30 miles deep , but a few have occurred as far down as 400 miles ...
Page 138
... ROCK OF AGES REEDEN Many thoughtful people choose their family monument - as well as their cemetery plot - before the need arises . Ask your nearest Rock of Ages Dealer for " How To Choose a Family Monument " - a large illustrated ...
... ROCK OF AGES REEDEN Many thoughtful people choose their family monument - as well as their cemetery plot - before the need arises . Ask your nearest Rock of Ages Dealer for " How To Choose a Family Monument " - a large illustrated ...
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