Saltwater Unit Review

Which best explains how estuaries support plant and animal life?

• The dry land removes pollutants.
• The water provides energy for growth.
• The habitat areas provide nutrients and shelter.
• The cold water remperatures decrease dissolved oxygen.

Which best explains where the richest deposits of oil and natural gas can be located?

• Continental shelves
• Intertidal zone
• Deep Zone
• Coral Reef

Most of the oxygen in Earth's atmosphere is produced in the top six inches of the ocean. Which best explains this?

• Oxygen is produced as a by-product as fish breathe through their gills.
• Oxygen is produced by seawater, which evaporates into pure oxygen and hydrogen.
• Oxygen is produced by deepwater plants and is then moved to the surface of the ocean.
• Oxygen is produced by photosynthetic microorganisms that live near the surface of the ocean.

Which technique uses sound waves to measure the depth of the ocean floor?

• Global positioning system
• Radar
• Sonar
• Surface

Which best describes the source of oxygen in the ocean?

• 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.

Which characteristic distinguishes an estuary from other bodies of water?

• plant life
• animal life
• salinity level
• dissolved oxygen

Which causes cold ocean water to rise during an upwelling event?

• motion of organisms
• deep water currents
• mass of nutrients
• surface winds

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

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

Which factors limit the productivity of a marine ecosystem?

• availability of light and nutrients
• availability of nutrients and freshwater
• availability of light and chemosynthetic organisms
• availability of photosynthetic organisms and freshwater

Which part of hte ocean do the greatest number of organisms live?

• in the deep zone to escape predators
• near the shore to burrow
• close to the surface to be near the largest food source
• in the open ocean to regulate their bodies in cooler temperatures