302 Science Chapter 6 Review

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Across
  1. 3. rock that forms when melted rock cools and hardens
  2. 6. a nonliving material made of one or more minerals
  3. 9. layer of soil with the most minerals and humus
  4. 10. a mixture of minerals, weathered rocks, and other things
  5. 11. bits of decayed plants and animals found in soil
  6. 13. what happens when harmful things get into water, air, and land
  7. 15. tiny bits of weathered rock or once-living animals or plants
  8. 17. rock that has been changed by heating and squeezing
  9. 21. a resource that can not be replaced or reused easily
  10. 24. soil made from a mixture of sand, silt, and clay
  11. 25. melted rock inside Earth
  12. 26. a resource that can be replaced or used again
  13. 27. color of the powder left when a mineral is rubbed across a white tile
  14. 28. minerals people value for their beauty
  15. 29. how a rock's grains look
  16. 30. describes how light bounces off a mineral
Down
  1. 1. the hardest mineral
  2. 2. a solid nonliving substance found in nature
  3. 4. layer of soil with less humus
  4. 5. to use resources wisely
  5. 7. remains of something that lived long ago
  6. 8. a material that is burned for energy
  7. 12. peat which has changed into sedimentary rock
  8. 14. a material on Earth that is necessary or useful to people
  9. 15. a kind of rock that forms from layers of sediment
  10. 16. water held in rocks below the ground
  11. 18. describes how easily a mineral can be scratched
  12. 19. empty space in rock where something once was
  13. 20. melted rock that flows onto Earth's surface
  14. 22. pipes or ditches which carry water
  15. 23. energy from the Sun