Magnetic reversals of the Earth's field have occurred on the ...

[plus1]

Magnetic reversals of the Earth's field have occurred on the average every 200,000 years over the past 5 million years. When was the last magnetic reversal?
 a. about 200,000 years ago
  c. about 990,000 years ago
  b. 1792
  d. about 780,000 years ago

Question 2

If one could transport a simple pendulum of constant length from the Earth's surface to the Moon's, where the acceleration due to gravity is one-sixth (1/6) that on the Earth, by what factor would the pendulum frequency be changed?
 a. about 6.0
  c. about 0.41
  b. about 2.5
  d. about 0.17

[mtmmmmmk]

Answer to Question 1

D

Answer to Question 2

C