Oceans and Marine Ecosystems

Which will most likely result if there is increased upwelling in a coastal area?

• more aquatic life
• less nutrients in the water
• 
  higher water temperatures
• 
  fewer nitrates

In which oceanic zone do clams and crabs survive by burrowing in the sand?

• 
  oceanic
• intertidal
• deep ocean
• open ocean

Which is able to give the most detailed information about the topography of a large area on the ocean floor?

• sonar
• submersibles
• scuba divers
• satellite images

Which best describes the shallow water ocean zone?

• The long water column protects small organisms from being eaten by large predators.
• Cooler water temperatures cause a decrease in dissolved oxygen needed by organisms.
• 
  Sunlight penetration increases algae growth and provides food for a variety of organisms.
• Hydrothermal vents provide heat and dissolved minerals needed by some organisms to survive.

In which location would fishermen most likely catch a greater number of fish?

• at the shoreline
• in an upwelling 
• in the intertidal zone
• on the deep ocean floor

Which hazard must submersible vehicles overcome while exploring and studying the deep ocean zone?

• high waves
• increased salinity
• high water pressure
• underwater mountain ranges

Why are many fishing boats found near ocean upwellings?

• There is less vegetation there.
• Upwellings are found in more shallow waters, so boats do not need deep anchorage.
• 
  The water is less turbulent there.
• Many marine species gather there to eat the nutrients brought to the surface.

Which contributes most in supporting life on the deep ocean floor?

• cold water temperatures
• extreme water pressure
• hydrothermal vents
• lack of predators

In which ocean zone is ocean temperature most affected by the weather?

• deep zone
• polar zone
• transition zone
• surface zone

Which best describes the source of oxygen in ocean water?

• Oxygen is produced by marine plants in the process of making food.
• 
  Oxygen is produced through the exhalations of marine animals.
• 
  Oxygen is produced through precipitation falling on the ocean.
• Oxygen is produced by nodules on the ocean floor.