« previous next »

Author Question: What substance was able to show previous orientations of Earth's magnetic field? a. Magma b. ... (Read 56 times)

notis

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

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



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

Did you know?

Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

Did you know?

Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

Did you know?

Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

Did you know?

Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

Visual Field Defects Visual Field Defects
Magnetic resonance imaging (MRI). The MRI lab includes the scanning instrument and a computer statio Magnetic resonance imaging (MRI). The MRI lab includes the scanning instrument and a computer statio
The first step in field recovery involves surveying the site, sometimes with special equipment. The first step in field recovery involves surveying the site, sometimes with special equipment.
For Gulf War veterans, lack of social support in the field is related to postwar depression. The ... For Gulf War veterans, lack of social support in the field is related to postwar depression. The ...
Earth Atmosphere Earth Atmosphere
Earth’s tilt and yearly rotation around the sun cause seasonal effects. The 23° tilt of Earth’s ... Earth’s tilt and yearly rotation around the sun cause seasonal effects. The 23° tilt of Earth’s ...
Video: Helper T cell receptors, activation, proliferation, differentiation & action

For a complete list of videos, visit our video library