Sarahy's Science Crossword.

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Across
  1. 3. colorless liquid that forms in rivers, seas, and rain.
  2. 7. the regions of the surface,atmosphere and hydrosphere of the earth.
  3. 9. a number considered in comparative relation to a whole.
  4. 10. a continuous area or expanse which is free, available, or unoccupied.
  5. 11. the biggest star.
  6. 12. a set of things working together as parts a mechanism or an interconnecting network
  7. 13. the planet on which we live on.
Down
  1. 1. shows the relative sizes of two or more values.
  2. 2. spherical concentric regions of matters that make up the earth and its atmosphere.
  3. 4. a celestial body distinguished from the fixed stars by having an apparent motion of its own
  4. 5. the study of life science
  5. 6. the chief Roman god, husband of Juno, and god of light, of the sky and weather, and of the state and its welfare and its laws.
  6. 8. a numerical quantity that is not a whole number
  7. 11. sixth planet from the Sun and the second-largest in the Solar System.