Author Question: What substance was able to show previous orientations of Earth's magnetic field? a. Magma b. ... (Read 40 times)

notis

  • Hero Member
  • *****
  • Posts: 596

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

  • Sr. Member
  • ****
  • Posts: 326
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.




Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

Did you know?

Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.

Did you know?

Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.

Did you know?

Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

Did you know?

When intravenous medications are involved in adverse drug events, their harmful effects may occur more rapidly, and be more severe than errors with oral medications. This is due to the direct administration into the bloodstream.

For a complete list of videos, visit our video library