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Students will investigate the effects of magnets on the needle of a compass and compare this to the effects of Earths magnetic field on the needle of a compass.
Harcourt Science, Grade 4,2002
Harcourt Science, Grade 5,2002
Electricity and Magnetism, Glencoe, McGraw-Hill
Electricity and Magnetism, Prentice Hall
Playing with Magnets, Gary Gibson, Copper Beech Books
Magnetism, John Woodruff, Raintree Steck-Vaughn
Magnets, Steve Parker, Lorenz Books
The Magnet Book, Shar Levine and Leslie Johnstone, Sterling Publishing Co., Inc.
Magnetism, Peter Riley, Franklin Watts
Earth has two magnetic poles. One is called the Magnetic North Pole and the other is called the Magnetic South Pole. These magnetic poles are where compasses point. These poles cause a huge magnetic field from pole to pole like the magnetic field of a bar magnet. If we were able to sprinkle iron filings on Earth like we can a bar magnet, the iron filings would line up just as the iron filings do on the bar magnet with many lines curving from the North Pole to the South Pole. The theory is that the molten iron in Earth's outer core generates a substantial magnetic field that penetrates through to Earth's surface. It is like there is a huge bar magnet that goes through Earth from the North Pole to the South Pole.
Because Earth is like a huge bar magnet, a compass acts the same on Earth as it does around a bar magnet. If you were to move a compass clockwise around a bar magnet, keeping the compass in the same direction the whole time, the needle would rotate once as you went from the north end to the south end, and then rotate back to the north end. The same would happen on Earth. If you could travel by air from the North Pole to the South Pole and back to the North Pole, keeping the compass in the same direction the whole time, the needle would rotate once as you went around Earth.
These magnetic poles and Earth's geographic poles are not identical. The geographic poles are where Earth spins causing night and day. The magnetic poles are close to the geographic poles, but the magnetic poles are slightly tilted a few degrees away from Earth's geographic poles.
1-Use science process and thinking skills.
2-Manifest scientific attitudes and interests.
4-Communicate effectively using science language and reasoning.
5-Demonstrate awareness of social and historical aspects of science.
Invitation to Learn:
Instead of making Earth have the children make their own world of water, continents, and lines. Give it a name. Write about their new world.
This lesson is part of the Fifth Grade Science Teacher Resource Book (TRB3) http://www.usoe.org/curr/science/core/5th/TRB5/. The TRB3 is designed to be your textbook in teaching science curriculum to your students. This book covers all the objectives of each standard and benchmark. If taught efficiently, a student should do well on the End-of-Level (CRT) tests. The TRB3 is designed for teachers who know very little about science, as well as for teachers who have a broad understanding of science.