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Across 5. of igneous rock that has solidified beneath the earth's surface 7. liquid rock on Earth's crust 10. igneous rock produced by eruption and solidified on or near the earth's surface 13. a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals 14. shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity 15. a fine-grained metamorphic rock that can be split into thin layers 16. condition in which the earth's surface is worn away by the action of water and wind 17. molten rock generated within the earth 19. a measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake) 21. # an objective measure of the strength of an earthquake. It measures the degree of magnitude. 23. a hard crystalline metamorphic rock that takes a high polish 24. Outer layer of Earth composed of tectonic plates. 32. the gradual movement and formation of continents (as described by plate tectonics) 33. igneous- very light gray to a medium gray- contains a large number of gas bubbles each surrounded by a thin layer of volcanic glass- looks something like a sponge- very light weight- most pieces will float in water- flow lines or bands may show 34. a bend in rock that forms where part of the earth's crust is compressed. 35. plutonic igneous rock having visibly crystalline texture 36. the middle layer of the earth and is found just below the crust 37. forms when sand, mud, and pebbles at the bottom of rivers and oceans pile up and cement together 38. the point inside the Earth where an earthquake begins

Down 1. the commonest type of solidified lava 2. ard metamorphic rock consisting essentially of interlocking quartz crystals 3. fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period 4. A location on the surface of the Earth directly above the point(focus) where an earthquake occurs. 6. Circular currents in the mantle caused by the magma being heated by the core off the Earth. 8. a mountain that forms when magma reaches the surface 9. a composite rock made up of particles of varying size 11. an upward bend or fold in a rock layer 12. a sedimentary rock formed by the deposition of successive layers of clay 18. Rocks formed when other rocks are put under extreme heat and pressure 20. a hypothetical continent that (according to plate tectonic theory) broke up later into India and Australia and Africa and South America and Antarctica 22. Sections of the Earth's crust that move due to convection currents. 25. a downward bend or fold in a rock layer 26. rock that solidified from magma 27. (geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other 28. a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.) 29. the process that crumbles, cracks, and breaks rocks (slow change by wind and water) 30. Liquid layer below the mantle. It is probaly made of melted iron. 31. solid, dense center of the Earth