Earth’s Magnetic Field
Physics ⇒ Earth and Space Physics
Earth’s Magnetic Field starts at 8 and continues till grade 12.
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See sample questions for grade 8
Describe how scientists know that Earth’s magnetic field has reversed in the past.
Describe one way in which Earth’s magnetic field is important for life on Earth.
Describe what happens to a compass needle at the magnetic equator.
Explain what is meant by ‘magnetic declination’.
Explain what would happen if Earth’s magnetic field disappeared.
Explain why a compass needle points north.
Explain why the magnetic poles are not fixed.
If the magnetic declination at a location is 10° east, what does this mean?
What is the approximate angle of inclination of Earth’s magnetic field at the equator?
What is the approximate time interval between magnetic reversals on Earth?
What is the function of the magnetosphere?
What is the main cause of Earth’s magnetic field?
What is the main element in Earth’s outer core that helps generate the magnetic field?
What is the name of the process by which Earth’s magnetic field is generated?
A scientist measures the direction of a compass needle at different locations on Earth. She notices that the needle tilts downward at the North Pole and is horizontal at the equator. What does this observation tell us about the shape of Earth’s magnetic field?
Describe how the tilt between Earth’s rotational axis and its magnetic axis affects navigation using a compass.
Explain how the movement of liquid iron in Earth’s outer core leads to the creation of a magnetic field.
Explain why the magnetic field lines are closer together at the poles than at the equator.
If a spacecraft leaves Earth and travels far into space, what happens to the strength of Earth’s magnetic field as the distance from Earth increases?
