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Across 1. stress that occurs when two tectonic plates collide 7. stress that occurs when two tectonic plates pull apart from each other 9. slightly larger than Mars, center of the Earth 11. formed along the divergent boundary in the middle of the Atlantic Ocean 13. layer of the Earth that is liquid 14. pieces of the lithosphere 16. fault formed when there is tension 17. the surface along which rocks break and slide past each other

Down 1. process by which hot material from deep within the Earth rises while cooler material near the surface sinks 2. solid middle layer of the Earth located between the asthenosphere and the outer core 3. region where oceanic plates sink down into the asthenosphere 4. boundary where the tectonic plates move away from one another 5. tectonic plate boundary involving the collision between two tectonic plates 6. layer of the Earth just below the lithosphere 8. occurs when rock layers bend due to stress 10. made primarily of Fe and Si, makes up most of the Earth's mass 12. fault usually caused when tectonic forces push rock together 15. outermost layer of the Earth made primarily of silicon and oxygen