Rock Stars!

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Across
  1. 3. formed by cooling of magma
  2. 6. formed by heat & pressure
  3. 8. gradual process of wearing away by water, wind, ice
Down
  1. 1. active volcanco in Hawaii
  2. 2. formed from layers of rock, sand, mud, silt
  3. 4. scientist who studies history of earth in rocks
  4. 5. molten rock found within the earth
  5. 7. rock with many tiny holes in it