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Author Question: What substance was able to show previous orientations of Earth's magnetic field? a. Magma b. ... (Read 41 times)

notis

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on: Aug 22, 2018

What substance was able to show previous orientations of Earth's magnetic field?
  a. Magma
  b. Basalt
  c. Magnetite
  d. Magnesium



Question 2

What keeps Earth's asthenosphere pliable?
  a. Chemical composition of the asthenosphere
  b. The density of the asthenosphere
  c. Earth's internal heat
  d. Insulation from the lithosphere



Jevvish

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Reply #1 on: Aug 22, 2018
Answer to Question 1

ANS: C
Magnetite is in the mantle. When new crust is formed, the magnetite is in that crust. As it cools, it
points in the direction of the current magnetic field of the Earth. This allowed scientists to determine
the direction of magnetic fields throughout history. Information can be found in the section The
Confirmation of Plate Tectonics



Answer to Question 2

ANS: C
The asthenosphere remains pliable due to the internal heat of the Earth. This heat is thought to travel
through the Earth's interior via conduction. The lithosphere is able to remain in motion because of that
pliability. Information can be found in the section A New Understanding of Earth Evolved Slowly.



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