Across
- 1. Feature of convergent boundaries, characterized by exploding lava
- 9. Type of sound device used to map the ocean floor by bouncing sound waves off objects
- 10. Name of the research ship that was used to map the ocean floor
- 11. Type of boundary where two plates slide past one another
- 13. Feature of convergent boundaries, formed by one plate sliding below another plate and forming a deep opening
- 14. Instrument used to measure seismic waves
- 16. Theory that the continents are slowly moving over time
- 17. Earth's crust and upper mantle; split up into the tectonic plates
- 19. Type of boundary where two plates separate
- 20. Feature of divergent boundaries, made up of a single underwater mountain
- 21. One piece of Earth's lithosphere
- 22. Instrument used to measure magnetic properties, such as those of basalt on the seafloor
- 23. Feature of all types of plate boundaries
Down
- 2. Upper layer of mantle, just below lithosphere
- 3. Theory that Earth's lithosphere is broken up into pieces, which are slowly moved over time by convection currents
- 4. Feature of divergent boundaries, made up of many connected underwater mountains
- 5. The location where two tectonic plates meet
- 6. The force that moves tectonic plates; movement of a fluid such as molten rock to transfer heat
- 7. Type of boundary where two plates collide
- 8. The outermost layer of the Earth
- 12. The thickest layer of the Earth, made up of semi-molten rock
- 15. Feature of convergent boundaries, created when two plates collide and rock is forced upwards
- 18. Feature of divergent boundaries, characterized by a V-shaped low region