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Across 1. When an experiment is being conducted to investigate the effect of a single variable of interest on a particular system 3. plate boundary where two plates slide past each other in opposite directions 4. model that describes how rocks slowly change one from another 8. process in which rock is physically broken down into smaller pieces 11. process by which molten materials adds new oceanic crust to the ocean floor 13. the layer we live on 16. process by which wind, water, ice, or gravity move weathered rock and soil 17. single landmass that broke apart 200 millon years ago 18. molten rock that flows from volcanoes 19. hypothesis that the continents slowly move across earth's surface

Down 1. plate boundary where two plates move towards each other 2. a big molten ball in the center of the earth 5. process that breaks down rock through chemical changes 6. plate boundary where twoplates move past each other 7. the layer under the layer we live on and the layer before the core 9. theory that pieces of earth's lithosphere are in constant motion, driven by convection currents in the mantle 10. process that breaks down rocks at earth's surface 12. process by which sediments is laid down in a new location 14. process in which oceanic crusts sinks beneath a deep ocean trench and back into the mantle at a convergent boundary 15. hot melted rock material beneath earth's surface