Author Question: The Earth reversed its magnetic field about how many years ago? A) 700 B) 700,000 C) 11 D) ... (Read 90 times)

kamilo84 · **on:** Jul 27, 2018

The Earth reversed its magnetic field about how many years ago?

A) 700
B) 700,000
C) 11
D) 7000
E) 70,000,000

Question 2

A ray of light, which is traveling in air, is incident on a glass plate at a 45 angle. The angle of refraction in the glass

A) is greater than 45.
B) is less than 45.
C) is equal to 45.
D) is unknown because it all depends on the index of refraction of glass.