Earth Magnetic Field

How often do magnetic reversals occur?

• Once every million years.

• Every 10,000 years on average.

• Every 200,000 to 300,000 years on average.

• Every 50,000 to 100,000 years on average.

Which of the following animals use Earth's magnetic field to navigate?

• Lions

• Elephants

• Birds

• Fish

Which of the following statements is true about Earth’s magnetic poles?

• They are the areas where Earth’s magnetic field is strongest.

• They are located at Earth’s geographic poles.

• They are the areas where Earth’s magnetic field is weakest.

• Earth has four magnetic poles.

Earth's magnetic field and a bar magnet attract particles to the same locations. Where are they?

• The middle

• All around the outside

• The north and south poles

• First to the middle, then to the ends

Earth acts like a giant magnet because its center is made up MOSTLY of:

• granite

• limestone

• iron

• nickel

The region in which Earth's magnetic field is found is called the:

• atmosphere

• stratosphere

• aurora

• magnetosphere

Magnetic field lines are closet together at the __________.

• poles

• lines

Tags

NGSS.MS-PS2-5

Earth's magnetic poles are in the same place as the geographic poles.

• True

• False

The area of magnetic force around a magnet is known as its _____________.

• magnetic field

• magnetic declination

• magnetic fan lines

• magnetic tan lines

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

A ________ is a device that has a magnet on a needle that spins freely. It is used for navigation because its needle usually points north.

• calculator

• ruler

• compass

• map