6th Grade Topic 8: Plate Tectonics

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Across
  1. 3. ridge an underwater mountain range formed by the movement of Earth's tectonic plates.
  2. 10. trench a deep, narrow valley on the ocean floor formed where a tectonic plate is being pushed underneath another plate during subduction.
  3. 12. when one tectonic plate moves under another and sinks into the Earth's mantle. It can create deep-sea trenches and cause earthquakes and volcanoes.
  4. 13. Where two tectonic plates meet.
  5. 16. spreading new ocean floor is made at mid-ocean ridges
  6. 17. boundary where two tectonic plates move toward each other. This can create mountains, volcanoes, and deep ocean trenches.
  7. 18. Deep-sea feature formed by subduction.
  8. 19. a force that acts on rocks in Earth's crust, causing them to change shape or break.
  9. 23. is no longer exists or is completely gone
  10. 24. a mountain or opening in Earth's crust where melted rock, ash, and gases can escape.
  11. 25. Mid-ocean feature indicating plate movement.
  12. 27. When magma reaches the surface.
Down
  1. 1. a type of stress that squeezes rocks together. It can make rocks fold or break, like pressing two sides of a sponge toward each other.
  2. 2. molten material beneath Earth's surface.
  3. 4. boundary a place where two tectonic plates are moving away from each other. As they separate, magma rises from below, creating new ocean floor.
  4. 5. Supercontinent when all land was fused.
  5. 6. Sudden movement due to plate stress.
  6. 7. Remains of organisms found on separate continents.
  7. 8. a break in Earth's crust.
  8. 9. a type of stress that stretches rocks apart. It makes rocks thinner in the middle, like pulling on a piece of gum until it stretches out.
  9. 11. measures the strength or size of an earthquake. It's like a rating that tells us how much energy was released during the quake.
  10. 14. Large sea wave triggered by undersea earthquakes.
  11. 15. spot area deep inside the Earth where magma (melted rock) rises up through the crust to the surface.
  12. 20. boundaries where two tectonic plates slide past each other horizontally. This side-by-side movement can cause earthquakes.
  13. 21. a type of stress that pushes rocks in opposite, sideways directions. It's like rubbing your hands together — the rocks can slide past each other and even break.
  14. 22. Landform created by eruptions.
  15. 26. "asleep" or "inactive."