http://www.ck12.org Chapter 5. Energy
Explore More
At the following URL, listen to the streaming audio (or read the article) about magnetic field reversals. Then answer
the questions below. http://science.nasa.gov/science-news/science-at-nasa/2003/29dec_magneticfield/
- How has Earth’s magnetic field changed during the past 200 years?
- How often do magnetic field reversals occur? When did the last one take place?
- How long does it take for a magnetic field reversal to occur? Describe what happens to Earth’s magnetic field
during that time.
Review
- What is a magnetic field reversal?
- Explain how rocks on the ocean floor provide hard evidence that magnetic reversals occurred in the past.