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My father dug this piece of petrified wood from a riverbed outside of Texarkana Arkansas approximately 25 years ago. He passed away in 2009 so I never got any more information from him regarding it. My question is how would I go about polishing it or just sealing it from the climate? The crystals are what I'm concerned about with the idea of polishing it.
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Diamonds May Not Be So Rare As Once Thought (open access PDF)
Oxytropidoceras posted a topic in Rocks & Minerals
Diamonds May Not Be So Rare As Once Thought Johns Hopkins Scientists’ Chemical Model Shows a Simpler Deep Earth Formation, Joh Hopkins http://releases.jhu.edu/2015/11/03/diamonds-may-not-be-so-rare-as-once-thought/ https://www.sciencedaily.com/releases/2015/11/151103140444.htm Dimitri A. Sverjensky and Fang Huang, 2015, Diamond formation due to a pH drop during fluid–rock interactions Nature Communications 6, Article number: 8702 (2015) doi:10.1038/ncomms9702 https://www.nature.com/articles/ncomms9702 Yours, Paul H.-
- aqueous geochemistry
- diamonds
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a metabolism? I've read in many places now that "life" is very difficult to define. A big question in biology, paleontology, or science in general is "what is life?" or "how do we define life?". NASA's definition is "A self-sustaining chemical system capable of Darwinian evolution". But I'm just wondering why life shouldn't be defined as "anything with a metabolism". Has anything ever lived that didn't have a metabolism? Is there anything that is non-living that does have one? Thanks. Scott
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Dear experts, As my first step, I'll preciate any information about this fish fossil of my own. It is about 21" large and has a gross weight of more than 10 pounds. Thanks a lot in advance for your valuable help.