Unit E Section 2 & 4

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Across
  1. 2. a trace of once-living things preserved in rocks
  2. 3. rock that forms under intense heat and pressure
  3. 6. ____________ prospecting using instruments to detect mineral deposits
  4. 8. molten rock under the surface of the earth
  5. 11. the substances that make up rock
  6. 13. when a mineral breaks into a smooth surface
  7. 14. rock that forms from layers of sediment
  8. 15. made up of minerals
  9. 16. layers of sedimentary rock
  10. 17. era with the dinosaurs
  11. 20. igneous rock that forms under the surface of the earth
  12. 21. rock that forms from cooled lava or magma
Down
  1. 1. ____________ prospecting using chemical analysis of samples to detect minerals present
  2. 4. era where the earth formed and live began
  3. 5. era with the first reptiles, insects, land plants, and fish with jaws
  4. 7. a measure of how easily a mineral can be scratched
  5. 9. when a mineral breaks with rough uneven surface
  6. 10. molten rock on the surface of the earth
  7. 12. era with humans and grasses
  8. 16. the colour of the powder that is left behind when its rubbed against a surface
  9. 18. igneous rock that forms on the surface of the earth
  10. 19. the way the surface of a mineral reflects light