1. Which is TRUE:

       All estuaries are partly surrounded by land and have tides.

       All estuaries are places where fresh water from rivers and streams mixes with salt water from the ocean.

       All estuaries are found between barrier islands and the mainland.

2. A fjord is:

       A type of estuary formed by folds and faults in the Earth's crust

       A flooded coastal river valley

       An estuary formed by the flooding of deep valleys cut by glaciers

3. Why are there more kinds of plants in tidal freshwater marshes than in salt marshes?

       Tidal freshwater marshes are farther upstream, so there are more nutrients than in salt marshes.

       There are fewer animals that eat the plants in tidal freshwater marshes.

       There is not any salt in tidal freshwater marshes.  Very few plants can survive in the salty water that floods salt marshes.

4. What happens to tidal swamp forests if they are flooded with salt or brackish water too often?

       The trees will die and the swamp will turn into a marsh.

       The trees will die and the swamp will turn into deep water.

       The trees will die and the swamp will turn into bare mud.

5. Anadromous fish:

       Are fish that spend their whole life in the estuary

       Are fish that live in the ocean but swim up freshwater rivers and streams to spawn

       Are fish that live in freshwater rivers and streams but travel to the estuary to spawn

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