science

Edit Answers
123456789101112131415161718192021222324252627282930313233
Across
  1. 2. — Point on Earth’s surface directly above the focus.
  2. 5. — Thin, outer solid layer of Earth.
  3. 6. Plane — Surface along which fault movement happens.
  4. 8. Earthquake — Quakes that occur near the surface—usually more destructive.
  5. 11. — Shear waves; slower and only move through solids.
  6. 12. — Elevated landforms, often formed by tectonic forces.
  7. 15. Discontinuity — Boundary between mantle and outer core; S-waves disappear and P-waves slow down. 
  8. 19. — Sudden ground shaking due to movement along faults.
  9. 20. — Technique using multiple seismic stations to locate an quake’s epicenter.
  10. 21. Wall — Rock block located above a sloping fault plane.
  11. 23. — The process of mountain formation through tectonics.
  12. 25. of Fire — Highly active seismic and volcanic zone around the Pacific rim.
  13. 26. Boundary — Where tectonic plates move apart (often forming ridges).
  14. 29. — Rock block located below a sloping fault plane.
  15. 30. Boundary — Where plates collide or one is forced beneath another.
  16. 31. (Hypocenter) — Subsurface point where an earthquake begins.
  17. 32. — Supercontinent that existed ~335–175 million years ago.
  18. 33. Discontinuity (Moho) — Boundary between crust and mantle, marked by a jump in seismic wave speed. 
Down
  1. 1. Drift — Early theory that continents move over time.
  2. 3. — Ancient global ocean surrounding Pangaea.
  3. 4. — Fast, compressional waves; move through solids and liquids.
  4. 7. Plates — Massive, rigid slabs of Earth’s lithosphere.
  5. 8. Waves — Energy waves from earthquakes used to explore Earth’s interior.
  6. 9. — Cracks in Earth’s crust where sliding occurs.
  7. 10. Waves — Slower, often more damaging waves that travel along Earth’s surface.
  8. 13. Core — Liquid metal layer around the inner core; generates Earth’s magnetic field.
  9. 14. – Portion of a tectonic plate that is being subducted into the mantle.
  10. 16. — Thick, mostly solid layer beneath the crust.
  11. 17. Discontinuity — Seismic speed jump around 220 km depth in the upper mantle.
  12. 18. Ridge — Undersea mountain chain formed at divergent plate boundaries.
  13. 22. Waves — Seismic waves (P and S) that travel through Earth’s interior.
  14. 24. Spreading — Formation of new ocean crust at mid-ocean ridges.
  15. 27. Boundary — Where plates slide sideways past each other.
  16. 28. Core — Solid, dense center of Earth.