Author Question: Although we don't know for sure, changes in the strength and orientation of earth's magnetic field ... (Read 41 times)

iveyjurea

  • Hero Member
  • *****
  • Posts: 555
Although we don't know for sure, changes in the strength and orientation of earth's magnetic field are most likely due to
 
  A) fluctuations in outer-core convection.
  B) variations in sea-floor spreading rates.
  C) the total number of mantle hot spots.
  D) changes in the velocity of subducting plates.

Question 2

True or False: Mantle convection occurs because upward-moving rock expands more by decompression than it contracts by cooling.
 
  Indicate whether this statement is true or false.



ricroger

  • Sr. Member
  • ****
  • Posts: 352
Answer to Question 1

Answer: A

Answer to Question 2

Answer: TRUE



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

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.

Did you know?

You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.

Did you know?

Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.

Did you know?

When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

Did you know?

In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.

For a complete list of videos, visit our video library