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kendreae kendreae
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7 years ago
Which stable (nonvariable) gas in the atmosphere is derived from the radioactive decay of potassium-40 (40K)? 
A)  oxygen 
B)  krypton 
C)  argon 
D)  carbon dioxide
Textbook 
Geosystems: An Introduction to Physical Geography

Geosystems: An Introduction to Physical Geography


Edition: 7th
Author:
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One touch of nature makes the whole world kin.  William Shakespeare
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twentytootwentytoo
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7 years ago
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kendreae Author
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7 years ago
You make an excellent tutor!
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Yesterday
Thanks for your help!!
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Thank you, thank you, thank you!
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