First Five Silently enter the room and sit

First Five �Silently enter the room and sit down in your assigned seat. �Begin working on your Activator. �When you’ve completed your Activator, read your DEAR book.

Today’s Objectives �IWBAT… Compare Earth’s magnetic field to a bar magnet’s magnetic field by describing Earth’s magnetic field and identifying geographic and magnetic poles. 2. Analyze the force of Earth’s magnetic field in order to explain how a compass works. 1.

The Earth is a magnet!! �Earth behaves as if it has a giant bar magnet moving through its core �The magnetic field that is created around Earth is very similar to the magnetic field of a bar magnet

Poles �The poles of this imaginary magnet are located near the Earth’s geographic poles However, these poles are opposite: �The magnetic south pole is closest the geographic north pole �The magnetic north pole is closest to the geographical south pole

There is iron in the core of the Earth �The earth acts as if a giant bar magnet has been stuck through the middle of it since the center is primarily composed of iron and nickel. �When the Earth rotates, electric currents flow in the iron

Compass �A compass needle is a small magnet and the tip points to the geographic north pole �Therefore, the point of a compass needle is attracted to the south pole of a magnet �Compass needles and north poles of magnets point to Earth’s magnetic south pole, which is near Earth’s geographic north pole

Compass �A compass always points towards North because the needle is attracted by the Earth’s magnetic field

A Magnetic Light Show �An aurora is a beautiful curtain of light. Earth’s magnetic field plays a part in making auroras. �An aurora is formed when charged particles from the sun hit the oxygen and nitrogen atoms in the air. The atoms become excited and then give off lights of many colors.

�Earth’s magnetic field blocks most of the charged particles from the sun. But the field bends inward at the magnetic poles. As a result, the charged particles can crash into the atmosphere at or near the poles.

How to Make Your Own Compass � 1) Rub a needle with a magnet quickly, this will make a magnetic field � 2) Place the needle on a piece of sponge or cork � 3) Place it in the water to float freely Watch and see! It will turn and face north! �

�A compass needle points _______ because the magnetic pole of the Earth that is closest to the geographical North Pole is a magnetic south pole. �Why does this make sense?

Exit Ticket �In the space below, draw Earth and its magnetic field. Label the geographic poles and the magnetic poles.