Unit 2: Earth's Water Mini EOG Review

1. Ben and Will are hiking on trails at Cedar Rock Park. They became thirsty, but forgot to bring drinking water with them. Will notices some very clear water in a nearby stream. Will cups his hands to fill them with the cool water to take a drink. His friend Bill stops him. Which statement best explains why Bill stops Will from drinking the water?

• A. The water needs to be warm to make sure there are no contaminants in it.

• B. The water needs to be colder to make sure there are no contaminants in it.

• C. Clear water is always safe to drink, but Will had not sanitized his hands.

• D. Clear water may contain colorless, tasteless, and odorless contaminants.

2. For a quick write assignment, students were asked to describe ways to maintain safe water quality standards for Lake Jeanette. The student’s responses are recorded below:

Brenden – “Control the temperature of the water”

Annie – “Reduce the amount of fertilizer used in nearby corn fields to reduce runoff”

Calista – “Treat waste water from nearby factories before releasing the water into the lake.”

Christopher – “Add large amounts of disinfectants into the lake.”

Which students methods were useful?

• A. Brenden, Calista, and Annie

• B. Calista and Christopher

• C. Annie and Calista

• D.  Annie, Calista, and Christopher.

3. For Marty’s science fair projected he conducted water quality test on a pond near his home. He found high levels of dissolved oxygen. What is the best conclusion about the water in this pond?D.   

• A.     Low diversity of organisms

• B. High diversity of organisms

• C. Low levels of nitrates and phosphates

• D. High levels of nitrates and phosphates

4. Travis was reading the article “Estuaries in North Carolina.” Based upon the article what statement explains why estuaries are important to the health of Earth’s ecosystems?

• A. They provide salt to the oceans.

• B. They protect the shoreline for large tidal waves. .

• C. They act as nurseries for breeding ocean organisms.

• D. They provide cold water to help maintain ocean temperatures

5. Four students were debating on how the ocean can contribute oxygen to the atmosphere. There concluding statements are below.” Which statement best describes the contribution of oxygen to the atmosphere.

• A.    Glenn – “Decomposition by cyanobacteria”

• B.    Emma – “Digestion by fish”

• C.    Jeremiah – “Respiration by whales.”

• D.    Maria – “Photosynthesis by phytoplankton.”

6. The city of Greensboro had a contest for 8th grade students to design posters about environmental stewardship. Below is a description of four of the posters. Which description best describes environmental stewardship?

• A.    A boy throwing aluminum can in a trash can.

• B.    A factory worker dumping industrial waste directly into a river.

• C. C. A wildlife officer posting a sign that limits the number of fish that can be removed from a lake during fishing season.

• D.    Construction of a new water park using a nearby reservoir.

7. Which best explains why estuaries are an important habitat for many marine organisms in comparison to the open ocean?

• A. There is less food in estuaries.

• B. There are more predators in estuaries.

• C. There is more salt available in estuaries.

• D. There are more nutrients available in estuaries.

8. Why are many fishing boats found near ocean upwellings?

• A.    There is less vegetation there.

• B.    The water is less turbulent there.

• C.    Many marine species gather there to eat the nutrients brought to the surface.

• D.    Upwellings are found in more shallow waters, so boats do not need deep anchorage.

9. Why is productivity greatest near the ocean’s surface?

• A. More predators live in the top layers of the ocean.

• B. Salinity at all layers of the open ocean in fairly consistent.

• C. Sunlight penetrates the top layers of ocean, so photosynthesis occurs there.

• D. Nutrients, minerals and gases are more available to marine life in the bottom layers of the ocean.