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Author Topic:   Age of Grand Canyon and Cave Speleothems
NoNukes
Inactive Member


Message 19 of 46 (681151)
11-23-2012 10:20 AM
Reply to: Message 16 by herebedragons
11-23-2012 9:18 AM


These rules leave no room for strong bases (NaOH and LiOH) . They are not salts, but they are not exceptions to the hydroxides are insoluble rule.
No set of simple rules is perfect, but perhaps adding hydroxides of Group IA elements are soluble to rule 5 would help. Or changing rule 1 to most compounds with Group 1A cations are soluble.

Under a government which imprisons any unjustly, the true place for a just man is also in prison. Thoreau: Civil Disobedience (1846)
The apathy of the people is enough to make every statue leap from its pedestal and hasten the resurrection of the dead. William Lloyd Garrison.
If there is no struggle, there is no progress. Those who profess to favor freedom, and deprecate agitation, are men who want crops without plowing up the ground, they want rain without thunder and lightning. Frederick Douglass

This message is a reply to:
 Message 16 by herebedragons, posted 11-23-2012 9:18 AM herebedragons has replied

Replies to this message:
 Message 21 by herebedragons, posted 11-23-2012 11:12 AM NoNukes has seen this message but not replied

  
NoNukes
Inactive Member


Message 39 of 46 (682171)
11-30-2012 11:40 AM


Date of creation of grand canyon
As I drove into work today, I heard a story on NPR discussing revisions to dating of the Grand Canyon. Apparently, some kind of helium dating technique when applied to soil samples from the canyon produces dates of about 70 million years, whereas the canyon has previously been thought to be only a few million years old.
I don't know anything at all about this topic, but I'd appreciate being filled in by people who do. Pointers to some reading material would also be helpful.

Under a government which imprisons any unjustly, the true place for a just man is also in prison. Thoreau: Civil Disobedience (1846)
The apathy of the people is enough to make every statue leap from its pedestal and hasten the resurrection of the dead. William Lloyd Garrison.
If there is no struggle, there is no progress. Those who profess to favor freedom, and deprecate agitation, are men who want crops without plowing up the ground, they want rain without thunder and lightning. Frederick Douglass

Replies to this message:
 Message 40 by Taq, posted 11-30-2012 11:49 AM NoNukes has seen this message but not replied
 Message 41 by ooh-child, posted 11-30-2012 11:59 AM NoNukes has seen this message but not replied

  
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