Author Question: Long fault lines spread out stress and produce smaller earthquakes than short ones. a. True b. ... (Read 111 times)

kwoodring · **on:** Jul 13, 2018

Long fault lines spread out stress and produce smaller earthquakes than short ones.
a. True
b. False

Question 2

Why is an understanding of Earths magnetic field important in the acceptance of the theory of plate tectonics?
What will be an ideal response?

britb2u · **Reply #1 on:** Jul 13, 2018

Answer to Question 1

ANSWER: False

Answer to Question 2

ANSWER: It is known that Earths magnetic field changes its polarity, or direction, with a long recurrence interval due to changes in currents in its core. New rock formed at divergent boundaries like the Mid-Atlantic Ridge records the polarity of Earths magnetic field. Observations of the recorded magnetic field in ridges around the Mid-Atlantic Ridge show that the stripes of alternating polarity surround the ridge. The conclusion is that the stripes represent rock created during different epochs of the magnetic field, demonstrating that the ridge is an area where new rock is created.