10/19

Estuaries are not generally areas where a lot of wildlife can be found.

• True

• False

What is brackish water

• Dirty water

• Clear Water

• Slightly salty water

• Ground water

The most abundant plants in the ocean are

• Zooplankton

• Phytoplankton

• Algae

• None of these

Currents caused by differences in water density are most often the result of

• uniform salinity and wind.

• uniform temperature and salinity.

• differences in temperature and salinity.

• differences in salinity and wind.

Which of the following is the best example of a food chain in a marine ecosystem?

• orca whale → seals → algae → salmon

• phytoplankton → mussels → otters → tuna fish → octopus

• algae → phytoplankton → shark → crab

• phytoplankton → krill → herring → mackerel → shark

Which of the gases below is found at high levels near the surface of the ocean due to plant photosynthesis?

• oxygen

• neon

• nitrogen

• carbon dioxide

Which process is diagrammed in the figure below?

• Evaporation

• tidal surge

• continental drift

• upwelling

Which of the following best describes why estuaries are important resources?

• They are the world's richest sources of precious metals.

• They are among the most productive types of ecosystems.

• They help stabilize the global climate.

• They prevent weathering of rock from slopes and cliffs.

The population of photosynthetic organisms is higher in the neritic zone and surface waters than in the deep ocean. Which statement best explains the reason for this?

• There is more space for plants to grow in these areas of the ocean.

• There is more dissolved oxygen for plants in these areas of the ocean.

• The availability of sunlight and nutrients supports photosynthetic organisms.

• The high salinity and cool temperature supports photosynthetic organisms.

Which factor prevents the growth of aquatic plants in the aphotic zone?

• absence of tides

• absence of sunlight

• underwater volcanoes

• salinity of water