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Across 5. a wave whose crest spills over its trough when it hits the shoreline 7. a dangerous undertow current that pulls from the shore to the sea 8. rising and falling of water level because of the gravitational pull of sun and moon 9. a tide produced when the bulge in the ocean levels caused by the gravitational pull of the sun and moon reaches shore 11. a tide produced when troughs in ocean caused by the gravitational pull of the moon and sun reach shore 12. microscopic plant plankton 15. waves created when energy is transferred to water 16. the lowest point of a wave 17. constructions of large rocks, boulders, or concrete slabs that help prevent beach erosion 18. an underwater current produced by incoming waves

Down 1. islands formed by sediment displaced by a rising sea level 2. the highest point of a wave 3. large-scale patterns of water circulation 4. organisms that live on the floor of the ocean 6. the process of removing and other deposits from the channel floor by pumping them to another location 10. microscopic animal plankton 13. microscopic plants and animals that live near the ocean surface 14. the category of marine life made up of free-swimming animals