Earth's Magnetic Field

question 144

Multiple Choice

Earth's magnetic field

• A) is variable, and it has faded to zero and returned to full strength with the polarity reversed.
• B) is constant in its intensity.
• C) remains a mystery as to its cause.
• D) is principally generated in the inner core.

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Definitions:

Demand

In economics, the quantity of a good or service that consumers are willing and able to purchase at various prices during a given period.

Copyrights

Legal rights given to creators over their creations, granting them exclusive rights to use and distribute their work for a certain period of time.

Marginal Cost

The hike in overall cost that comes with the assembly of an extra unit of a product or service.

Elasticity

A measure in economics to show how much the quantity demanded or supplied of a good responds to a change in price or other factors.