It was discovered by the 'journal Science Advances' that the last magnetic field of the Earth was reversed about 770,000 years ago, which scientists have named "Matuyama-Brunhes".The last event, called Matuyama-Brunhes, lasted for 4,000 years but the extended period of instability persisted for about 18,000 years. The new analysis is published after an overall study of lava flows, ocean sediment and beryllium deposition of Antarctica.
1. In which core earth's magnetic field is found?
A. The outer
B. The inner
C. The mid
D. None of these
2. Where is the northern magnetic pole currently around?
A. USA
B. Siberia
C. Greenwich
D. Atlantic
3. What makes, most of the outer core of the Earth's magnetism?
A. Iron
B. Magnesium
C. Lead
D. Copper
4. Where are the two poles located at?
A. Canadian Ocean & Off the cost of the.. Antarctica
B. Asia & Russia
C. Both of them
D. None of the above
5. The Earth Magnetic Field contains...
A. Two poles
B. Liquid iron
C. Its magnetic is shaped like a bar
D. All of above
6. What were the lava flow samples of Chile, Tahiti, Hawaii, Caribbean, and the Canary Islands stored for the analysis?
A. Combined Magnetic Readings
B. Combined Electric Readings
C. Combined Pole Readings
D. None of these
7. Which of the following was generated by the radioactive decay of potassium in rocks to find the time period of these lava flows?
A. Potassium
B. Sodium
C. Argon
D. Krypton
8. What is the effectiveness of radiation on the atmosphere during magnetic field reversal?
A. No change
B. Decrease
C. Increase
D. None of these
9. Who said that the earth behaves as a huge magnet?
A. William Gilbert
B. Robot menon
C. Rutherford
D. Galileo
10. Who invented the globe?
A. Martin Luther
B. Martin Behaim
C. Garibaldi
D. Newton
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