Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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 Check 

Across: 3. The formation of igneous rock causes contact metamorphism. Extrusion – bottom only affected, _________ – top and bottom affected. 4. Ocean trenches (_________ zone) where old crust is destroyed. Convergent Plate Boundary 7. All minerals properties are due to the ________ arrangement of the atoms. 8. Subsidence – the ________ of the crust 11. Need a minimum of _________ (a number spelled out) seismograph stations to determine the location of an epicenter. 12. Sedimentary rocks (strata) form (flat) horizontal _________. 13. P-waves travel through solids and _________. 15. ________ – the lifting of the crust (forms mountains)

Down: 1. Earth’s plates move due to _________ currents in the upper-mantle (asthenosphere) 2. Metamorphic Rock – changed by heat and/or _________. Shows banding/foliation (stripes) and distorted structure. Higher density, very resistant rock. 5. Silicon and ________ form earth’s basic mineralogical structural unit – the tetrahedron. 6. P-waves travel ________ than S-waves. 9. __________ rock (fire-formed) are classified by texture (grain size). Coarse (large) grains = Intrusive - (cooled slowly below surface). Fine (small) grains = Extrusive (cooled quickly). Glassy (no visible crystals) = Extrusive. 10. At the Mid-Ocean ridges (spreading center) _________ crust is created, age of the rock increases as distance from the ridge increases. Divergent Plate Boundary 14. S-waves travel through __________ only (can’t go through the outer core).