The Magnetic Field of Earth

question 158

Multiple Choice

The magnetic field of Earth

• A) is related to its rotation around its axis.
• B) has been almost constant throughout history.
• C) is associated with magnetic poles that are at the same locations as the geographic poles.
• D) is unique: It is the only planetwide magnetic field in the solar system.

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Definitions:

Interest

A fee applied to borrowed funds, usually calculated as a percent of the principal amount.

Loan

A sum of money that is borrowed, typically from a financial institution, and is expected to be paid back with interest.

Months

Units of time, each approximately 30 days long, used to measure durations and periods in a year.

Investment

Channeling funds into ventures with the expectancy of generating income or profit.