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Average density of the Earth is ( relative to water) __.

A. 5.5

B. 4.5

C. 9.5

D. 6.5

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  9. Sidereal means
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  11. A family or system of millions and millions of stars are called ____.
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  17. When a year divisible by 4 and not divisible by 400 is called
  18. How much is the variation In distance between the Earth and the Sun during aphelion and perihelion?
  19. Polar Auroras are called __ in Southern Hemisphere.
  20. Equatorial diameter of the Earth is __.
  21. When the earth is at its minimum distance from the Sun, it is said to be
  22. Which planet is called 'red planet'?
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