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Across 1. type of igneous rock that cools fast above ground , notallowing larger crystals to form 6. igneous rock; salt and peppery; light colored; intrusive 7. igneous rock; extrusive; cooled so quickly that there are no grains 10. dark gray , igneous rock, fine grained; makes up most of oceanic crust 12. fastest type of earthquake wave; travels through all materials 13. "field mineral"; most common specific mineral in continental crust 14. tall gently sloped volcanoe; lava very fluid; non-explosive 16. clear mineral; fizzes when HCl applied; you see double 19. steep, tall, explosive type of volcano made of different layers of ash, lava, cinders, mud 21. igneous rock; greenish black; dark colored; intrusive 23. clastic sedimentary; clay 25. dark colored mica 26. deep depression in subduction zone

Down 2. parallel sliding plate boundary 3. location of the surface directly above the earthquake source 4. when one plate is converges and dives under the other 5. sedimentary, clastic, has pebbles 8. mechanism responsible for plate movement and earth magnetic field 9. lavea explodes into the air, rains down small cooled fragements that pile up 11. most common general category of mineral in crust; made of silicon and oxygen atoms with tetrahedral units 15. formed at the spreading center 17. igneous rock; extrusive; fine grained; light-colored 18. foliated, looks like banded granite 20. only half as fast as P waves; can't go through liquids or gases 21. lead sulfide mineral; blocky cleavage; metallic luster 22. olive green mineral containing a lot of iron and magnesium 24. when shale undergoes metamorphism it converts to this