Earthquakes: A Teacher's Package on Earthquakes for Grades by American Geophysical Union

By American Geophysical Union

Released through the yankee Geophysical Union as a part of the exact guides Series.

Earthquakes are mysterious occasions. they're as unpredictable as they're robust, and never even seismologists absolutely comprehend the forces in the Earth that set them in movement. As an educator, you could capitalize on that mysterious entice have interaction your scholars' interest.

Ultimately, even if, the aim of this curriculum is to demystify earthquakes, and to counter the fatalism that often accompanies lack of knowledge approximately normal phenomena. Interactive classes invite scholars to find what's identified approximately quakes-the enormous physique of data that bargains with their explanations, the styles in their incidence, and what people can do to reduce their catastrophic results on themselves and their groups.

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One end will be loose, as shown on the illustration. b. Stroke one of the strips with one pole of the magnet. Then stroke the next strip with the other pole of the magnet. T E A C H I N G CLUES A N D CUES When the magnet is passed over the loose ends of the tape, the strips will move. Their direction will depend on which end of the magnet they were stroked with. This activity works best if the card is held upside down with the tape hanging down. c. Create patterns of magnetism by mixing up the order in which you stroke the strips of tape, then give the cards to other groups to interpret.

On a map of the Pacific Ocean floor, locate the Hawaiian Islands and the chain of islands that forms the Emperor Seamounts. Note the sharp bend in the line of seamounts. Ask students: • What could have caused the bend? (a change in the direction of plate movement) • What does this bend, and the long pattern of reversals illustrated in the earlier activities, indicate about the possibility of the Pacific Ocean closing? ) A D A P T A T I O N S A N D E X T E N S I O N S 1. Challenge students to find out how magnetometers work and how scientists use them, then report to the class.

2a, Tectonics Background. 2a with the students. Point out to students that on a world map continental land masses seem to have a jigsaw fit. Early mapmakers noted this long ago when drawing the first maps of the new world. B. Procedure 1. Ask the students how magnets work. Some may already know that alignment of atomic forces creates the magnetic "pull," or force field. Tell students that when a magnet is heated it loses its magnetic force, and when it cools down it again picks up the faint trace of the Earth's magnetic field.

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