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Sun Structure and Activity (Grade 9)

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Sun Structure and Activity

1. 
About 25% of the Sun is composed of hydrogen.
  1. True
  2. False
2. 
Different parts of the sun rotate at different speeds.
  1. True
  2. False
3. 
Sunspots are                 regions of the Sun's surface
  1. hotter
  2. cooler
4. 
What is the approximate diameter of the sun?
  1. 150 million km
  2. 1.4 million km
  3. 15 million km
  4. 100 million km
5. 
Approximately how old is the Sun?
  1. 450,000 years
  2. 4.5 million years
  3. 4.5 billion years
  4. 4.5 trillion years
6. 
The luminosity of the sun results from its
  1. color
  2. rotation
  3. magnetic field
  4. energy emission
7. 
Fusion occurs in the Sun's               .
  1. core
  2. corona
  3. photosphere
  4. chromosphere
8. 
The Sun contains about                 of the mass in our solar system.
  1. 25%
  2. 50%
  3. 87%
  4. 99%
9. 
Which phrase best describes the sun's age in its stellular life cycle?
  1. newborn
  2. young adult
  3. middle aged
  4. end of life
10. 
The part of the Sun that emits visible light and is typically seen from Earth is the
  1. core
  2. photosphere
  3. radiative zone
  4. chromosphere
11. 
Which statement best describes the sun's hydrostatic equilibrium?
  1. the generation of energy by radiation balances the loss of the sun's energy by fusion
  2. the loss of the sun's energy by radiation balances the generation of energy by fusion
  3. the inward push of gravity balances the outward push of the sun's internal pressure
  4. the outward push of the sun's internal pressure balances the inward force of gravity
12. 
Galileo’s observation of the motion of sunspots provided evidence for which of the following?
  1. the rotation of the sun
  2. the sun’s chemical composition
  3. the layered structure of the sun
  4. the shape of Earth’s orbit around the sun
13. 
The temperature of the photosphere is
  1. cooler than the core and corona
  2. hotter than the core and corona
  3. cooler than the core and hotter than the corona
  4. hotter than the core and cooler than the corona
14. 
Describe the sun's rotation.






15. 
Compare and contrast solar winds and flares.






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