Science 3rd 9 wks words

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Across
  1. 3. the outermost layer of the earth that we live on
  2. 4. The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle
  3. 6. A deep valley along the ocean floor through which oceanic crust slowly sinks towards the mantle
  4. 8. The soft layer below the lithosphere
  5. 9. The process by which molten material adds new oceanic crust to the ocean floor.
  6. 11. the largest layer of the earth, below the crust
  7. 12. The amount of mass in a given space
  8. 14. Plates that move away from each other
Down
  1. 1. a layer of molten iron and nickel that surrounds the inner core of the earth
  2. 2. The hypothesis that the continents slowly moved across the Earth's surface
  3. 3. Plates that move together
  4. 5. The undersea mountain chain where new ocean floor is produced; a divergent plate boundary.
  5. 7. A type of boundary in which two plates move by each other, can cause earthquakes
  6. 10. The hard, rigid layer made up of the crust and upper mantle
  7. 13. a dense sphere of solid iron and nickel in the center of the earth