Heat

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Across
  1. 2. energy energy that all moving objects possess (has more when particles are moving faster and less when particles are moving slower)
  2. 4. the transfer of thermal energy through a substance or between substances in contact, by the collision of particles
  3. 7. contraction a decrease in the volume of a substance caused by cooling
  4. 8. energy radiant energy produced at the sun's outer surface and radiated out into space
  5. 12. energy the energy contained below Earth's surface
  6. 13. solar energy system a device that collects radiant energy + converts it to a more useful form of energy
  7. 15. theory of matter a theory that explains what matter is made of, and how it behaves
  8. 16. energy energy that travels in the form of electromagnetic waves through empty space; includes visible light, ultraviolet radiation, and infrared radiation
  9. 18. energy source a source of energy that has been widely used for many years
  10. 20. rock rock formed from magma that has cooled and solidified
  11. 22. warming increase in Earth's global temperature due to changes in the atmosphere, enhancing the greenhouse effect
  12. 23. effect rise in temperature resulting from certain gases in the lower atmosphere trapping radiant energy and warming Earth's surface
  13. 26. a measure of the average kinetic energy of the particles of a substance
  14. 28. energy resource a source of energy that can be used indefinitely, without running out
Down
  1. 1. fuels concentrated sources of chemical energy such as coal, oil, and natural gas
  2. 3. expansion an increase in the volume of a substance caused by heating
  3. 5. energy the total kinetic energy and energy of attraction of all the particles in a material
  4. 6. solar heating heating caused by the passage of radiant energy through the windows of a building
  5. 9. energy source a source of energy that is not as common as conventional sources
  6. 10. the transfer of thermal energy from one part of a fluid to another by a circulating current of fast-moving and slower-moving particles
  7. 11. rock rock that is formed when heat and pressure change existing rock
  8. 14. a force produced when objects rub against each other
  9. 17. a liquid fuel, such as ethanol, produced from plant or animal material
  10. 19. energy resource a source of energy that could eventually be used up
  11. 21. the transfer of energy from the particles of a warmer object to the particles of a cooler object
  12. 24. the transfer of radiant energy by means of electromagnetic waves
  13. 25. gases gases such as water vapor, carbon dioxide, methane, and nitrous oxides that trap energy in Earth's atmosphere
  14. 27. energy balance the balance between the energy lost by Earth into space and the energy gained by solar radiation trapped by Earth's atmosphere