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Across 3. The chemical process that turns carbon dioxide into oxygen 4. Tectonic plate boundary where two plates push against each other; explosive volcanism is present 7. Oceanic crust is composed of _______ 10. Tectonic plate boundary where two plates move apart from each other 11. The amount of mass in a given volume 12. A major nutrient necessary for plant growth

Down 1. Microscopic organism in water that are photosynthetic 2. Place where lava reaches the surface and new seafloor is created 5. The percent of salt in water. Measured in Parts Per Thousands 6. Continental crust is composed of________ 8. Deep depression in the ocean floor associated with subduction zone 9. Tectonic plate boundary where two plate rub past each other; powerful earthquakes