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Chelseaamend

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Upon combustion, which naturally occurring substance in coal is released to potentially create acid rain?
 
  A) Nitrogen
  B) Uranium
  C) Oxygen
  D) Sulfur
  E) All of the above

Question 2

In what geologic time period would the mammoth in this image have existed?
 
  A) Neogene to Quaternary Periods
  B) Cambrian Period
  C) Jurassic to Cretaceous Periods
  D) Permian Period



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wshriver

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Answer to Question 1

Answer: D

Answer to Question 2

Answer: A




Chelseaamend

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Reply 2 on: Jul 15, 2018
:D TYSM


bassamabas

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Reply 3 on: Yesterday
Gracias!

 

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