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Sun Structure and Activity (Grade 9)

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Sun Structure and Activity

About 25% of the Sun is composed of hydrogen.
  1. True
  2. False
Different parts of the Sun rotate at different speeds.
  1. True
  2. False
Sunspots are                 regions of the Sun's surface.
  1. hotter
  2. cooler
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
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
The luminosity of the Sun results from its
  1. color.
  2. rotation.
  3. magnetic field.
  4. energy emission.
Fusion occurs in the Sun's                .
  1. core
  2. corona
  3. photosphere
  4. chromosphere
The Sun contains about                 of the mass in our solar system.
  1. 25%
  2. 50%
  3. 87%
  4. 99%
Which phrase best describes the Sun's age in its stellar life cycle?
  1. newborn
  2. young adult
  3. middle aged
  4. end of life
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.
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.
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
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.
Describe the Sun's rotation.

Compare and contrast solar winds and flares.

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