McGraw Hill - Imagine It - 4th grade
'Rarely' means about the same as
The Earth has a hot iron 'core.' The 'core' of something is its
An electric 'current' can produce its own magnetic field. In this sentence, a 'current' is a
There is no 'friction' from wheels on rails on a magnetic train. 'Friction' is
Opposite poles 'attract'. 'Attract' means
What are most magnets made of?
What is the push or pull of a magnet called?
What makes a compass work?
Which of these has an electromagnet in it?
A North pole of a magnet will always be attracted to
How does the Earth act like a huge magnet?
Why is a magnetic train faster than an ordinary train?
In what form is iron usually found?