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Author Question: Earth's atmosphere became oxygen rich about 2.45 ________ years ago. A) billion B) million C) ... (Read 47 times)

audragclark

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on: Aug 22, 2018
Earth's atmosphere became oxygen rich about 2.45 ________ years ago.
 
  A) billion
  B) million
  C) trillion
  D) thousand

Question 2

All true oceanic islands are ________ in origin.
 
  A) collisional
  B) erosional
  C) metamorphic
  D) sedimentary
  E) volcanic


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jasonq

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Reply #1 on: Aug 22, 2018
Answer to Question 1

A

Answer to Question 2

E


audragclark

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Reply 2 on: Aug 22, 2018
Excellent

nguyenhoanhat

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Reply 3 on: Yesterday
Gracias!

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