Earth's Ocean Systems

Pamlico Sound is an estuary because it is

• A. an area fed by several rivers

• B. an area that many watersheds drain into

• C. an area that is protected by land on both sides

• D. an area where freshwater mixes with saltwater

An ocean basin is

• A. a continuous body of water that covers 70% of Earth’s surface.

• B. a deep trench along the floor of the ocean

• C. a part of Earth’s surface covered by ocean water

• D. the layer of the ocean closest to the surface

What is the source of most of the salt in the ocean?

• A. human activities

• B. rocks on land

• C. fish

• D. wind

Which are the main producers in the ocean?

• A. algae and other microscopic organisms

• B. seaweed growing on the ocean floor

• C. sea grasses growing on the ocean floor

• D. microorganisms living near vents in the ocean floor

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Producers in the upper part of the ocean get nutrients from

• A. their roots, which grow into the ocean floor

• B. materials brought to the surface by upwellings

• C. dead organisms floating in the water

• D. river water that washes out to the ocean

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How are estuaries different from lakes or the ocean?

• A. Estuaries contain only salt water.

• B. Estuaries contain only freshwater.

• C. Estuaries contain both saltwater and freshwater.

• D. Estuaries are not bodies of water.

Which interaction illustrates a terrestrial-aquatic food web relationship?

• A. a bear eating fish in a river

• B. a turtle burying eggs in the sand

• C. a fish eating plankton in the ocean

• D. a bird laying eggs in a nest in a tree

Which example best represents an interconnection between an aquatic food web and a terrestrial food web?

• A. Fish eat insects that land on the surface of a pond.

• B. Snakes eat bird eggs.

• C. Bats eat mosquitoes.

• D. Mountain lions catch and eat deer.

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What are the most likely effects of ocean upwelling?

• A. increased nutrients and increased populations of algae and fish

• B. decreased photosynthesis and increased chemosynthesis

• C. increased water temperature and decreased dissolved oxygen

• D. increased pollution and decreased animal and plant populations

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Which organism is most likely to be found in an estuary environment?

• A. crab

• B. whale

• C. jellyfish

• D. dolphin