Day and night

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Across
  1. 2. _______ scattering
  2. 5. When the sun is highest in the sky
  3. 7. Average kinetic energy of particles
  4. 9. When the sun is not visible
Down
  1. 1. When the sun is visible
  2. 3. Imaginary line around the middle of the Earth
  3. 4. The two places on Earth on the axis of rotation
  4. 6. Energy transferred due to a difference in temperature
  5. 8. When the less than half the sun is visible