CHEMISTRY REVIEW

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Across
  1. 3. it is the solid, the thinnest and outermost layer of the Earth
  2. 5. scientists who study fossils are called ....
  3. 6. an ancient insect perfectly preserved inside hardened tree resin is called
  4. 8. an acid found in stomach.
  5. 9. marble is a metamorphic rock that forms from which original rock
  6. 12. an indicator that turns red in acid and blue in alkali.
  7. 14. a substance with a pH greater than 7.
  8. 15. coal is a type of … rock formed from plant and animal remains
  9. 17. the scale used to measure how acidic or alkaline a substance is.
Down
  1. 1. crystal on the igneous rock was made of ….
  2. 2. it is the hot, metallic centre of the Earth.
  3. 3. an acid found in citrus fruits like lemons and oranges.
  4. 4. sedimentary rock is most likely to be ... meaning it has tiny spaces between grains that can hold water
  5. 7. intrusive igneous rocks have large crystals because they cooled very
  6. 10. rock formed when any type of rock goes through changes caused by extreme heat and pressure
  7. 11. molten rock found beneath the Earth's surface.
  8. 13. a substance with a pH less than 7.
  9. 16. a rock formed from the cooling of molten magma or lava.