Magnetic field reversals/Quiz

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The image shows a theoretical model of the formation of magnetic striping. Credit: US Geological Survey.

Magnetic field reversals is a lecture and an article of the charge ontology project.

You are free to take this quiz based on magnetic field reversals at any time.

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Quiz[edit]







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Ignore the questions' coefficients:

1

Yes or No, The observed magnetic profile for the seafloor across the East Pacific Rise tends to agree with a profile calculated from the Earth's known magnetic reversals.

Yes
No

2

The first magnetic field reversal noticed by the hominins of Earth is likely to be which of the following?

the Sun
the Small Magellanic Cloud
Scorpius X-1
the Earth
the Crab Nebula

3

Yes or No, Any field reversal may be linked to biological extinction.

Yes
No

4

True or False, Cooled crustal rock moving outward from the Mid-Atlantic ridge retains a record of the Earth's magnetic field.

TRUE
FALSE

5

Yes or No, The precession peaks found in the δ18O record from core MD900963 are in excellent agreement with climatic oscillations predicted by the astronomical theory of climate.

Yes
No

6

Which of the following is not a phenomenon usually associated with sunspots?

solar photosphere
a hole in the granulated photosphere
production of 7Be
rotation
solar cycle
starspots
flip-flop cycle

7

Yes or No, The calculations do not confirm an inherent magnetic reversal property of the Earth.

Yes
No

8

Chemistry phenomena that may be associated with magnetic field reversals are

ions and radiation may stream down upon the Earth's surface during a field reversal
molecules
atmospheres
the ionosphere may touch the Earth's crust
the surface of the ocean may become ionized
plastic may become brittle

9

Yes or No, The reversals may arise from tectonic events or from impacts from extraterrestrial objects.

Yes
No

10

True or False, The Earth's geomagnetic field reverses its polarity at irregular time intervals.

TRUE
FALSE


Hypotheses[edit]

Main source: Hypotheses
  1. Magnetic field reversals may be induced by excessive influx or outflux of charge.

See also[edit]

External links[edit]

{{Astronomy resources}}{{Charge ontology}}{{Physics resources}}