Exploring Earth's oceans

Which of the following is the base of the ocean food web?

• A. seal
• B. fish
• C. plankton
• D. shrimp

How are estuaries connected to oceanic organisms?

• A. Estuaries provide sunlight for oceanic organisms.
• B. Estuaries provide primary food for oceanic organisms.
• C. Estuaries provide excess dissolved oxygen for oceanic organisms.
• D. . Estuaries provide a nursery grounds for oceanic organisms.

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

• A. more aquatic life in the area
• B. more turbidity 
• C. fewer nitrates
• D. higher water temperatures

Which best explains why the water cycle mostly occurs over the oceans?

• Salt water evaporates more quickly than freshwater
• The temperatures over the oceans are warmer than over land.
• Most of Earth’s water is located in the oceans.
• The temperatures over the oceans are cooler than over land     

How would excessive  increases in nitrate and phosphorous concentration affect freshwater systems?

• It would cause excessive algal blooms
• .It would cause increased dissolved oxygen.
• . It would cause increased water clarity. 
•    It would cause extremely cold water.

Which explains why there are fewer marine organisms in the deeper zones of the ocean?

• amount of light decreases
• pollution increases
• salinity increases
• ph increases

Which best describes organisms that live in the intertidal zone?

•  they can all swim
• they are all fish
• . they can survive in both freshwater and saltwater
• They can survive in  both air and water

To which condition do all species in the ocean depths have to adapt?

• lower salinity
• extreme pressure
• swift pressure
• . hot water temperature

As the temperature of the ocean increases, which most likely occurs?

• the level of dissolved oxygen decreases
• the rate of photosynthesis increases
• the amount of minerals decreases         
• the level of dissolved nitrogen increases

Why is sonar used for mapping the seafloor?

• it tells the speed of ocean currents
• it tells scientists the amount of sunlight per ocean zone
• . it tells scientist the temperature ocean water
• . it determines the depth of the ocean floor