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Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. A technique that uses sound waves to measure the depth of the ocean floor is a.dredging.b.sonar.c.SCUBA.d.weighted lines. ____ 2. Which of the following does NOT make studying the ocean floor difficult a.The ocean consists of salt water rather than fresh.b.The deep ocean is in total darkness.c.The water in the deep ocean is extremely cold.d.There is tremendous pressure in the deep ocean. ____ 3. A deep canyon in the ocean floor is called a(n) a.abyssal plain.b.seamount.c.trench.d.continental shelf. ____ 4. Sea-floor spreading occurs in places where two plates are a.converging.b.diverging.c.motionless.d.breaking the surface. ____ 5. Benthos are organisms that live a.on the surface of water.b.throughout the water column.c.on the ocean floor.d.in shallow water. ____ 6. Which of the following organisms is an example of nekton a.lobsterb.dolphinc.clamd.sea star ____ 7. Many organisms that live in the rocky intertidal zone are adapted to cling to the rocks to withstand the a.pounding of the waves.b.changes in salinity.c.periods of being underwater and exposed to air.d.changes in density. ____ 8. As ocean water in a tide pool warms and evaporates, the remaining water becomes a.cooler.b.saltier.c.calmer.d.darker. ____ 9. A coastal inlet or bay in which freshwater from rivers mixes with salty ocean water is called a(n) a.transition zone.b.abyssal plain.c.estuary.d.hydrothermal vent. ____ 10. Coastal wetlands that feature short, gnarled trees with arching prop roots are called a.mangrove forests.b.kelp forests.c.salt marshes.d.tide pools. ____ 11. The part of the ocean that extends from the low-tide line to the edge of the continental shelf is the a.neritic zone.b.open-ocean zone.c.intertidal zone.d.deep zone. ____ 12. Under which set of conditions would there be more giant kelps in a kelp forest a.more sea urchins and fewer sea ottersb.no sea ottersc.more sea