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Across 3. layer of the Earth that is liquid 6. fault formed when there is tension 9. region where oceanic plates sink down into the asthenosphere 12. formed along the divergent boundary in the middle of the Atlantic Ocean 13. stress that occurs when two tectonic plates pull apart from each other 15. outermost layer of the Earth made primarily of silicon and oxygen 16. solid middle layer of the Earth located between the asthenosphere and the outer core 17. the surface along which rocks break and slide past each other 18. made primarily of Fe and Si, makes up most of the Earth's mass

Down 1. stress that occurs when two tectonic plates collide 2. pieces of the lithosphere 4. slightly larger than Mars, center of the Earth 5. layer of the Earth just below the lithosphere 7. occurs when rock layers bend due to stress 8. process by which hot material from deep within the Earth rises while cooler material near the surface sinks 10. tectonic plate boundary involving the collision between two tectonic plates 11. boundary where the tectonic plates move away from one another 14. fault usually caused when tectonic forces push rock together