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Author Question: The last pole reversal occurred ________ years ago and, based on magnetic field decay, we are ... (Read 62 times)

Mollykgkg

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on: Jul 14, 2018
The last pole reversal occurred ________ years ago and, based on magnetic field decay, we are approximately ________ years from entering the next phase.
 
  A) 1 million; 200,000
  B) 20,0000; 50,000
  C) 1,000; 50
  D) 790,000; 1,000

Question 2

The horizon that is commonly called topsoil is the ________ horizon.
 
  A) A
  B) O
  C) E
  D) B
  E) C


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carlsona147

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Reply #1 on: Jul 14, 2018
Answer to Question 1

D

Answer to Question 2

A


Mollykgkg

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Reply 2 on: Jul 14, 2018
Gracias!

olderstudent

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Reply 3 on: Yesterday
Wow, this really help

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