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This is an activity about the declining strength of Earth's magnetic field. Learners will review a graph of magnetic field intensity and calculate the amount by which the field has changed its intensity in the last century, the rate of change of its... (View More)

Audience: Middle school, High school
Materials Cost: Free

Students begin this activity by building a model of Earth’s magnetic field using a bar magnet to show Earth’s Ring current (the magnetic field which is in opposition to Earth’s magnetic field). Using this model, students will then observe the... (View More)

Keywords: Magnetism
Audience: High school
Materials Cost: $10 - $20 per group of students
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