SSA Earth & Space review

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Across
  1. 4. The death of a large star by explosion
  2. 6. bang theory: A theory that says the universe began as a small point and expanded rapidly about 13.7 billion years ago
  3. 8. A system consisting of all of the interactions that occur between the abiotic and biotic factors within an environment
  4. 10. A chemical reaction during which plants convert radiant energy from the Sun to chemical energy
  5. 14. body/object: Objects such as planets, moons, and stars that are located in the sky or in space
  6. 16. A physical property relating the amount of matter in a substance to the volume of the substance
  7. 17. of conservation of matter The principle that the mass of all reactants must equal the mass of all products because matter is neither created nor destroyed
  8. 18. The smallest unit of an element that has all of the properties of that element and contains a nucleus within an electron cloud
  9. 19. hole: An object with the mass of more than four suns squeezed into a ball only 10 km across whose gravity is so strong that even light cannot escape
Down
  1. 1. A process by which animals use oxygen and food to make energy and carbon dioxide
  2. 2. Pure substance made of two or more kinds of atoms bound together
  3. 3. A celestial body of ice, dust, and rock with an elongated and elliptical orbit
  4. 4. Any of the relatively cool dark spots appearing periodically in groups on the surface of the Sun that are associated with strong magnetic fields
  5. 5. A pure substance composed of the same type of atom throughout
  6. 7. Attraction between two objects with a strength that is proportional to the masses of the objects
  7. 9. year: A unit of length equal to the distance that light travels through space in one year
  8. 11. The tiny, very dense, positively charged region in the center of an atom that is made up of protons and neutrons
  9. 12. A negatively-charged subatomic particle of the electron cloud that is involved in the formation of chemical bonds
  10. 13. A large grouping of stars in space
  11. 15. Large cloud of gas and dust in interstellar space that is the location of star formation