Compasses How Do They Work

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.

How is Earth's magnetic field similar to that of a magnet?

• It is hundreds of miles long
• It has north and south poles
• It is made in Earth's core
• It is shaped like a horseshoe

What is our best evidence that Earth has a magnetic field?

• All things fall toward Earth's center
• A compass needle lines up with it
• Winds blow from east to west
• Earth's oceans all have currents

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

Why does a compass needle point north?

• The compass is a bar magnet
• Because north is up
• Because it's magic
• It lines up with the Earth's magnetic field

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

• granite
• limestone
• iron
• nickel

A ___________ is a device that has a magnetized needle that can spin freely. 

• magnet
• compass
• filing
• electron