Magnetic field reversals/Quiz

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

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

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Quiz

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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

Main resource: Hypotheses

1. Magnetic field reversals may be induced by excessive influx or outflux of charge.

See also: Control groups, Proof of concept, and Proof of technology

See also

• Astrophysics/Quiz
• Electromagnetic interaction/Quiz
• Radiation/Quiz
• Strong interaction/Quiz
• Weak interaction/Quiz

External links

• African Journals Online
• Bing Advanced search
• Google Books
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• Lycos search
• NASA's National Space Science Data Center
• Office of Scientific & Technical Information
• Questia - The Online Library of Books and Journals
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• The SAO/NASA Astrophysics Data System
• Scirus for scientific information only advanced search
• Spacecraft Query at NASA
• SpringerLink
• Taylor & Francis Online
• Wiley Online Library Advanced Search
• Yahoo Advanced Web Search

{{Physics resources}}{{Radiation astronomy resources}}