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Q: Which of the following is a radioisotope used to date rock formations? A. carbon-14 B. uranium-235 C. cobalt-60 D. carbon-12
A: A. carbon-14
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Asked 5/23/2012 1:48:15 PM
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what helps explain the trend in life expectancy in America? A. Multinational corporations have increased. B. Health care technology has improved. C. Satellites broadcast television around the world. D. More immigrants enter the country every year.
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Updated 8/26/2014 7:02:15 AM
1 Answer/Comment
Health care technology has improved. This helps explain the trend in life expectancy in America.
Added 8/26/2014 7:02:14 AM
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Ninety-nine percent of all the matter that can be observed in the universe exists as A. gases. B. plasmas. C. liquids. D. solids.
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what does sublimation mean
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Updated 9/15/2014 6:23:30 AM
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Sublimation in chemistry is the transition of a substance directly from the solid to the gas phase without passing through an intermediate liquid phase.
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the electron cloud model means what? A. the most likely locations of electrons in atoms B. the precise locations of electrons in atoms C. the number of electrons in an atom D. the mass of the electrons in an atom
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Updated 227 days ago|10/9/2017 2:59:27 AM
1 Answer/Comment
Cloud model describes the most likely locations of electrons in atoms.
Added 227 days ago|10/9/2017 2:59:27 AM
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