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- 1. Multiple Choice
In what layer of Earth is the magnetic field generated?
Inner Core
Outer Core
Magnetosphere
Biosphere
- 2. Multiple Choice
The outer core is in which state of matter?
Solid
Liquid
Gas
- 3. Multiple Choice
The magnetic field is created in the Earth's core. It streams out near the __ pole, loops around the planet, and then runs back into the core near the __ magnetic pole.
North, South
South, North
- 4. Multiple Choice
The sun has gravity as well as a magnetic field.
True
False
- 5. Multiple Choice
Believe it or not, what you just saw happens every few hours. Sometimes it is strong, sometimes it is weaker. What is the sun ejecting in a coronal mass ejection (CME)?
Nuclear Reaction
Charged Particles
Fire Bombs
- 6. Multiple Choice
The magnetic field protects us from __ from space
interstellar debris such as asteroids and crashing satellites
comets
solar wind and radiation
- 7. Multiple Choice
From what scientists learn about Earth's magnetic field, they can also learn about ____, _____ and _____. (choose 3)
International space station
Other stars
Our Sun
Black holes
- 8. Multiple Choice
Clay contains tiny particles of a mineral called ___.
Iron
lodestone
magnetite
- 9. Multiple Choice
In the last 300 years, the magnetic field has decreased by 10%.
True
False
- 10. Multiple Choice
The liquid metal in Earth's core is constantly moving.
True
False
- 11. Multiple Choice
It's really __ currents inside the Earth's __ that give Earth its magnetic field.
electric, mantle
radio, core
electric, core
- 12. Multiple Choice
On average, magnetic reversals happen once every __ years.
2 million
200
200,000
- 13. Multiple ChoiceMagnets can interact without touching.TrueFalse
- 14. Multiple Choice
The area of magnetic force around a magnet is known as its _____________.
magnetic field
magnetic declination
magnetic fan lines
magnetic tan lines
- 15. Multiple ChoiceA north pole and a south pole will attract.TrueFalse
- 16. Multiple Choice
Looking at the field lines in this picture, these two magnets are ________
Attracting
Repelling
Attracting and Repelling
Doing nothing
- 17. Multiple ChoiceWhat happens when two north poles of a magnet are placed together?they repelthey attractthey cancel each other outthe strength of the magnet is doubled
- 18. Multiple ChoiceWhat would happen if I move a bar magnet in and out of a coil of copper wire?Electric current would disappearThe magnet would explodeElectric current will flow through the wireIt would produce a gravitational field
- 19. Multiple ChoiceA magnet can move in a coil of wire to produce electricity in which system?GeneratorMotorMagnetTransformer
- 20. Multiple ChoiceWhat will happen when these magnets are brought close together?They will attract each other.They will repel each other.Both magnets will turn to the leftBoth magnets will turn to the right
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