Across
- 3. The name of the single landmass that broke apart 225 million years ago.
- 7. The amount of mass in a given space.
- 8. The soft layer of the mantle on which the lithosphere floats.
- 10. The movement of energy from a warmer object to a cooler object
- 12. The transfer of heat by movements of a fluid.
- 14. A plate boundary where two plates move past each other in opposite directions.
- 15. The process by which molten material adds new oceanic crust to the ocean floor.
- 19. The movement of a fluid, cause by differences in temperature, that transfers heat from one part of the fluid to another.
- 21. All living things. One of the 4 spheres into which scientists divide Earth.
- 22. The amount of force pushing on a surface or area.
- 26. A plate boundary where two plates move away from each other.
- 28. A dense sphere of solid iron and nickel in the center of Earth.
- 29. A rigid layer made up of the uppermost part of the mantle and the crust. One of 4 spheres into which scientists divide Earth.
- 30. The layer of hot, solid material between Earth's crust and core.
- 31. Earth's water and ice. One of the 4 spheres into which scientists divide Earth.
Down
- 1. The direct transfer of energy through empty space.
- 2. A deep valley that forms where two plates move apart.
- 4. The undersea mountain chain where new ocean floor is produced; a divergent plate boundary.
- 5. The transfer of heat from one substance to another by direct contact of particles of matter.
- 6. The hypothesis that the continents slowly move across Earth's surface.
- 9. The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary.
- 11. The scientist who first introduced the idea of Continental Drift.
- 13. A plate boundary where two plates move toward each other.
- 16. The theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle.
- 17. The mixture of gases that surrounds Earth. The outermost of the 4 spheres into which scientists divide Earth.
- 18. A section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust.
- 19. The layer of rock that forms Earth's outer surface.
- 20. A system that determines the distance of an object under water by recording echoes of sound waves.
- 23. A vibration that travels through Earth carrying the energy released during an earthquake.
- 24. A break or crack in Earth's lithosphere along which the rocks move.
- 25. A deep valley along the ocean floor through which oceanic crust slowly sinks toward the mantle.
- 27. A layer of molten iron and nickel that surrounds the inner core of Earth.