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Across 1. The force moving plates are called ______ _______. 4. The process of heating, rising, cooling and sicking in the mantle is called a ________ cycle. 5. __________ boundaries occur where two plates slide past each other. 9. The area where an oceanic plate subducts, or goes down into the mantle is called the _____ ______. 11. A _________ volcano is a steep sided mountain composed of alternating lava and tephra . 13. Mylonite is a dynamic ______rock which forms along fault zones. 17. When continental plates pull apart , they form _______ ________. 19. A large, circular depression caused by collapse of ground at the top of a volcano is called______. 22. The ____________are an example of a folded uplift mountain ranges. 24. A less dense oceanic plate sinks under the continental plate at a _________boundary. 26. The ______ ________ is the divergent boundary where the North American Plate is moving away from the Eurasian and African Plates. 27. _________, trenches and uplift occur at subduction zones 28. Fragments larger than about 2.5 inches are called _______. 31. The Appalachians formed mainly from continental plate ________and are considered a mountain range. 34. A __________wall occurs above the fault plane. 35. Earthquake waves including primary, secondary and surface waves are called _______waves. 36. Fossils are found in ________rocks. 37. They are massive avalanches of hot glowing rock flowing on a cushion of hot gasses. 38. The movement of smaller pieces of rock by wind, water or even ice ic called ________ 39. A vent that releases volcanic gases or water vapor is called________. 40. In a __________boundary, two plates are moving apart.

Down 1. A steep-sided, circular depression formed by either explosion or collapse at a volcanic vent is called_______. 2. The Himalaya mountains were formed as a result of ______ ______, where two plates colliding push of crust to form mountain ranges. 3. ________ takes place as rocks are broken down into progressively smaller pieces by the effects of weather. 6. Newly formed _________ forced upward along plate boundaries forms volcanoes. 7. Faults that form from pull-apart forces are called ______ _______ 8. An opening at the Earth’s surface through which volcanic materials erupt is called_______. 10. In a subduction zone, less dense _________ plates slide over the more dense Oceanic plate. 12. A ____ ______ occurs when continental plates diverge. 14. A reservoir of molten rock material beneath the Earth’s surface is called 15. Fragments of lava, rock, or sand-sized ash are called ______. 16. Large ________ faults occur in areas that have undergone great compressional forces 18. An example of a transform boundary is the ____ _____ fault. 20. The theory that continents were once one large land mass that over time broke up and moved to separate locations is called 21. _____ ______ are usually caused by a shift of tectonic plates. 23. cataclastic ________ occurs where rocks grind past each other along a fault, 25. In a _____ ______, the rock layers above the fault surface move up realtive to the rock layers below the fault. 29. When two oceanic plates converge, an _____ ______ and a trench are created. 30. ______is molten rock (fluid) typically deep below the surface, rich in silica (SiO2), which contains dissolved volatiles (e.g. CO2 and H2O). 31. Lava fragments about 1 centimeter in diameter are called _______. 32. A ___________ wall ccurs below the fault. 33. _________ rocks are formed as a result of cooling and crystallization from a magma.