This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: How do geologists know that the magnetic field of Earth has changed constantly over time? A) by ... (Read 96 times)

mydiamond

  • Hero Member
  • *****
  • Posts: 804
on: Jul 16, 2018
How do geologists know that the magnetic field of Earth has changed constantly over time?
 
  A) by the direction of historical lava flows, which they have been able to date with radioactive dating methods
  B) by crystals that have formed in metamorphic rocks
  C) by records kept in magnetic rock-forming minerals
  D) by analyzing and extrapolating records kept by scientists since the 1600s

Question 2

Why is the lower mantle thicker than the upper mantle?
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

cuttiesgirl16

  • Sr. Member
  • ****
  • Posts: 345
Reply #1 on: Jul 16, 2018
Answer to Question 1

Answer: C

Answer to Question 2

Answer: more pressure


mydiamond

  • Member
  • Posts: 804
Reply 2 on: Jul 16, 2018
Wow, this really help

adammoses97

  • Member
  • Posts: 337
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

Did you know?

The human body produces and destroys 15 million blood cells every second.

Did you know?

Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

Did you know?

By definition, when a medication is administered intravenously, its bioavailability is 100%.

Did you know?

Thyroid conditions may make getting pregnant impossible.

Mira as seen from the Earth Mira as seen from the Earth
Uranus's aurorae against its equatorial rings, imaged by the Hubble telescope. Unlike the auror Uranus's aurorae against its equatorial rings, imaged by the Hubble telescope. Unlike the auror
If you want to show differences between items at the same time, a bar graph is more effective than a If you want to show differences between items at the same time, a bar graph is more effective than a
How Orbital Eccentricity Changes the Amount of Solar Radiation Earth Receives How Orbital Eccentricity Changes the Amount of Solar Radiation Earth Receives
If the coil is working, the end of the magnetic pickup tool will move with the changes in the ... If the coil is working, the end of the magnetic pickup tool will move with the changes in the ...
Video: Embryonic development - Week 4

For a complete list of videos, visit our video library