Question	Answer
common ferromagnetic materials	iron, nickel, and cobalt
magnetosphere	the region of Earth's magnetic field shaped by the solar wind
solar wind	streams of electrically charged particles flowing at high speeds from the sun
magnetic field	the region around a magnet where the magnetic force is exerted
an aurora	the Northern Lights
magnetism	the force of attraction or repulsion of magnetic materials
temporary magnet	easily loses its magnetism
magnetic domain	a cluster of billions of atoms that all have magnetic fields lined up in the same way
unlike magnetic poles	attract each other
like magnetic poles	repel each other
magnetic field lines	never cross; they form complete loops from pole to pole; they spread out as they get farther from the magnet
the poles	where the magnetic force is the strongest
magnetic properties of a material	depend on its atomic structure
every magnet, regardless of its shape,	has two magnetic poles
a spinning electron	produces a magnetic field
solenoid	a coil of wire with a current
electromagnet	a solenoid with a ferromagnetic core
electromagnetism	the relationship between electricity and magnetism
an electric current produces	a magnetic field
the two ends of a solenoid	act like poles
the magnetic pole in the Northern Hemisphere is	in Northern Canada
one part of a freely swinging magnet always points	to Earth's magnetic pole in the Northern Hemisphere
most materials are not magnetic because	their magnetic domains are arranged randomly
as Earth's magnetic pole moves,	the magnetic declination in a given location will change
you can destroy a magnet's magnetism	by heating it or by dropping it or by striking it hard
since Earth produces a strong magnetic field,	Earth can make magnets
a magnet made from a steel paperclip is most likely	a temporary magnet
a compass behaves as it does	because of Earth's magnetic field
Earth's magnetic field can make a magnet out of an iron bar	by causing the magnetic domains to line up in the same direction
if you break a magnet in half	each half will be a new magnet, with both a north and south pole
characteristics of a magnetic field produced b a current are	it can be turned on and off; its direction can be reversed; and its strength can be changed
the closer together a magnet's magnetic field lines are,	the stronger the magnetic field
when molten material hardens into the rock on the ocean floor,	the domains of the iron it contains line up in the direction of Earth's magnetic field
uses of an electromagnet include	lifting heavy metal objects with a crane at a junkyard; recoding a song onto an audiotape; and recording a television show onto a videotape
you can increase the strength of an electromagnet's field by	using a stronger ferromagnetic material for the core; increasing the current in the solenoid; increasing the number of loops in the solenoid; and winding the coils more tightly

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