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Plate Tectonics Crossword 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Across Down 3. the outer layer of the Earth, between the surface and the mantle 1. the upper layer of the earth's mantle 2. where lava comes from 5. the assembly of most or all of the Earth's continental blocks to form a single large landmass 4. the movement of tectonic plate lithosphere from the convection currents in the asthenosphere 8. ground that is permanently frozen 6. the boundary between the plates 9. a pressing or being pressed 7. a measure of the warmth or coldness 10. a mechanism for plate motion in plate tectonics 13. the earth's interior between the crust and the core 11. a location on the Earth's surface that has experienced active volcanism 14. the vertical transport of atmospheric properties 12. a measure of mass per unit of volume 15. a long narrow excavation in the ground 16. opposite of cold 18. the outer part of the earth 17. the point on the earth's surface vertically above the focus of an earthquake 19. a crack in the earth's surface where there has been movement of one or both sides 20. valley a long narrow valley