7.18

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Across
  1. 2. | A series of events that repeat in a regular pattern, such as the rock cycle.
  2. 4. | A common mineral made of silicon dioxide.
  3. 5. | Rocks formed by the deposition and compaction of sediments.
  4. 6. | The preserved remains or impressions of ancient organisms.
  5. 7. | Molten rock beneath the Earth’s surface.
  6. 10. | Rocks formed from the cooling and solidification of magma or lava.
  7. 11. | Naturally formed aggregates of minerals.
  8. 12. | Molten rock that erupts onto the Earth’s surface.
  9. 13. | The movement of weathered materials by wind, water, or ice.
Down
  1. 1. | The breaking down of rocks into smaller pieces by natural processes.
  2. 3. | Solid materials whose atoms are arranged in an orderly, repeating pattern.
  3. 8. Rain | Rain that contains harmful acids formed from pollutants in the atmosphere.
  4. 9. | Naturally occurring solid substances with a definite chemical composition.