Which of these contain most of Earth's water?

Where is most of the freshwater on Earth located?

A rock layer that collects and stores water is called?

An area of land that drains into a river or lake is called

Pamlico Sound is an estuary because it is

An ocean basin is

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

Which is NOT a threat to living ocean resources?

Which are the main producers in the ocean?

Producers in the upper part of the ocean get nutrients from

How are estuaries different from lakes or the ocean?

An example of non-point source of pollution

A clear example of point-source pollution is

What is a possible effect of high nutrient levels in water systems?

Which of the following occurs when algae decompose in the ocean?

For what types of water does the Clean Water Act set water quality standards?

Which of the following are indicators of a healthy water source?

What is pollution?

A body of water that has a high turbidity is

Which of the following water pH levels is best for marine organism?

Which best describes a bioindicator

How can the atmosphere be considered part of the hydrosphere?

Which best describes a non-point source of pollution?

Which statement BEST explains the reason some insects can walk across the surface of a lake?

Which interaction illustrates a terrestrial-aquatic food web relationship?

Water temperature and depth of water are factors that can determine the type of organisms that live in different areas of the ocean. Which other factor is most important?

What is one way scientists analyze the health of a river?

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

What is one way the government of the United States attempts to reduce pollution in the oceans

The population density of marine life is greater along the shorelines of the ocean of the ocean than farther out in the deep waters of the oceans. Which statement provides the best reason for this situation?

An algae bloom in a water system is most likely caused by

One dry summer, a large number of fish suddenly died in a shallow river. Which is the BEST explanation for this fish kill?

Which of these is most likely to have a harmful effect on water quality?

What are the most likely effects of ocean upwelling?

Wilson Creek, a National Wild and Scenic River, flows through the Wilson Creek Gorge before it joins the Johns River. Which term best describes Wilson Creek?

Which factors are most characteristic of a healthy body of water?

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

If a body of water has low levels of dissolved oxygen, what can MOST LIKELY be concluded?

Phosphates help detergents make clothes whiter and clean dishes better. Which is the best reason why phosphates have been removed from detergents?

Which of these is NOT a body of freshwater

About what percentage of Earth's surface is covered with water?

What is the relationship between water and temperature and dissolved oxygen?

Which is a biological indicator of water quality?

Which best describes the area that separates water flowing into a river?

What is the most immediate effect of high levels of nitrates and phosphates in a body of water?

What is an indicator that a lake is healthy?

Why are faster moving rivers more likely to contain higher concentrations of dissolved oxygen than slower moving rivers

Which best explains why most of Earth's freshwater is NOT used for drinking?

Which is the correct statement regarding estuaries?

Which form of water has the highest density?

Which best explains the importance of dissolved gases in the ocean?

What are two sources of freshwater used by cities for drinking water?

Which of these processes is responsible for increasing dissolved oxygen levels in the oceans?

Which of the following could not live on the ocean floor of the oceanic zone?

How do nutrients move in the ocean as a result of upwelling?

What makes fertilizers a benefit to the farming industry?

Which of the pollutants below is an example of non-point source pollution?

What is the difference between a point-source pollution and non-point source pollution?

Upwelling is a process where winds blow surface water offshore, causing cold water from below the surface to rise upwards along with sediment. What is a possible consequence of upwelling?

A city in NC was supplied with drinking water from underground. It was observed that within 2 years of industrial development, the water became unfit for drinking. What could be a reason for this change?

A researcher collects water samples from three nearby lakes. He finds that the water sample from Lake 1 has a larger variety of invertebrates than Lake 2, while the water sample from Lake 3 has a few of one type of invertebrates. What can likely be concluded about the quality of water in the lakes?

In the USA, which is responsible for ensuring the safety of the country's drinking water?

Water that is safe to drink is called