Earth's Magnetic Field

In what direction does a magnetic field move?

• North to South

• South to North

• Left to right

• Positive to negative

Are these magnetic field lines attracting or repelling?

• repelling

• attracting

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Eli is holding two magnets close to each other. What will happen when he lets go?

• The magnets will not move because the magnets are not touching.

• The magnets will move closer to each other because the magnetic force will pull the magnets together.

• The magnets will move away from each other because the magnets are not touching.

• The magnets will move away from each other because the magnetic force will push the magnets apart.

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What is the main purpose of Earths magnetosphere (magnetic field)?

• To protect Earth from radiation from solar winds.

• To help keep the Earth rotating.

• It creates gravity.

• So that we know what direction we are going when using a magnet.

The South Atlantic Anomaly (SAA) is an irregular "dent" in the Earth's magnetic field. Why is it important for scientists to track this anomaly?

• Satellites that revolve in lower Earth orbit can be damaged by radiation let in by the dent

• The dent can let in radiation that can damage people and animals

• The dent can cause massive storms due to the increase in radiation

• Radiation let in by the dent can interfere with navigation equipment that uses magnets

Earth's magnetic poles are in the same place as the geographic poles.

• True

• False

Which layer of the Earth is responsible for Earth's magnetic field?

• outer core

• inner core

• mantle

• crust

What causes Earth's magnetic field?

• The rotation of the Earth

• The movement of molten iron in the Earth's outer core

• The gravitational pull of the moon

• The alignment of magnetic minerals in the Earth's crust

Which instrument is used to measure the Earth's magnetic field?

• Barometer

• Thermometer

• Magnetometer

• Anemometer

How often do Earth's magnetic poles reverse?

• Every 10,000 years

• Every 100,000 years

• Every 500,000 years to 1 million years

• Every 5 million years