Author Question: The last pole reversal occurred ________ years ago and, based on magnetic field decay, we are ... (Read 72 times)

Mollykgkg · **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