Which of the following explain why estuaries make good "nurseries" for so many marine species?

Waters are protected from wave impact

Plants provide cover for small organisms

True or False: Organisms that live in estuaries have to be able to tolerate high salinity all of the time and would die if they were placed in a low salinity environment.

False: They are adapted to survive changing salinity.

True: They are adapted to survive in saltwater.

Using the video and what you know about the density of water, predict why a "salt wedge" forms towards the bottom of the estuary.

Saltwater is more dense than freshwater, so the saltwater stays on the bottom.

Freshwater is more dense than saltwater, so it forces the saltwater down.

Because tides move in and out, the so called "salt wedge" is not a real phenomena.

Why are mudflats considered the "graveyard" of estuaries?

Organic debris is left when the tides recede.

Grass and plankton grow, protecting young fish

Due to plate technoics, the land is sinking

Based on what you learned about Mangrove trees, what part of the tree is most important to maintaining that ecosystem and why?

Roots, that trap debris and anchor the tree during tides

Leaves, for photosynthesis, as the base of the food chain

Bark, as a food source for crabs and raccoons

Trunk, to support the branches and leaves to protect small animals

Many organisms use estuaries as nurseries, while the adults live in the open ocean. How would this adaptation help the population survive?

The young are protected until they are large enough to be in the open ocean.

The adults do not have to compete with the young for food.

The young have abundant food in the form of plankton until they need larger prey.

Estuaries Notes 2025

Interactive Video

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Biology

•

12th Grade

•

Practice Problem

•

Easy

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NGSS

MS-LS2-1, MS-LS2-3, MS-LS2-4

Standards-aligned

Vicki Frausto

Used 32+ times

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31 questions

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SLIDE QUESTION

30 sec • Ungraded

SLIDE QUESTION

30 sec • Ungraded

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of water is found in estuaries?

Freshwater

Saltwater

Brackish water

SLIDE QUESTION

30 sec • Ungraded

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Estuaries are formed by which of the following processes?

Glaciers melt, sea levels rise, offshore sediments form barrier islands.

Land rises due to plate tectonics and create bays.

Cities have people donate christmas trees to build up sand dunes, which creates estuaries.

SLIDE QUESTION

30 sec • Ungraded

SLIDE QUESTION

30 sec • Ungraded

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