7th Grade Science

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Across
  1. 2. A number written below and to the right of a chemical symbol that shows the number of a specific type of atom present
  2. 5. The simplest unit of a chemical compound that can exist, formed when two or more atoms join together chemically
  3. 7. A system comprising all the biotic and abiotic factors in an area and all the interactions among them
  4. 9. The solid layer of Earth between the crust and the core; made of dense silicates
  5. 12. Anything that has volume and mass
  6. 17. The number of different species of plants and animals in an area
  7. 21. The process in which a denser plate is pushed downward beneath a less dense plate when plates converge
  8. 22. on or of Earth
  9. 23. A state of matter with definite volume and shape
Down
  1. 1. The mineralized remains of organisms, showing how long-dead organisms lived and how their bodies were structured
  2. 3. When more than one individual or population in an ecosystem relies on the same limited resources
  3. 4. A relationship between organisms or species that is helpful to both
  4. 6. A substance that takes part in and undergoes change during a chemical reaction
  5. 8. Melted, or molten, rock material beneath Earth’s surface; cools slowly to form rocks with larger crystals
  6. 10. A chemical reaction during which plants convert radiant energy from the Sun to chemical energy; the reaction converts carbon dioxide and water into sugar (glucose) and oxygen
  7. 11. The interaction between two animals in which one animal eats the other
  8. 13. A nonliving factor that affects the ecosystem
  9. 14. a living factor that affects the ecosystem
  10. 15. A substance produced during a chemical reaction
  11. 16. Energy transferred between two objects of different temperatures that moves continually in a predictable pattern, from a warmer site to a cooler site, until all sites have reached the same temperature
  12. 18. thin, solid, outermost layer of Earth; is either continental (landmasses) or oceanic (ocean floors)
  13. 19. The smallest particle of an element; made of electrons, protons, and neutrons
  14. 20. A sugar composed of six carbon atoms that is the preferred energy source for most cells; produced by photosynthesis