A dissolved oxygen probe measures what property of a stream sample?

What does a turbidity measurement indicate about a water sample?

Biochemical oxygen demand (BOD) measures which water-quality condition?

A pH test tells a field team about a water body's what?

When a water test reports nitrate concentration, what is being measured?

What does a phosphate test primarily measure in a pond sample?

A field team measures one stream parameter because it most directly sets how much dissolved oxygen fresh water can hold. Which parameter is it?

Electrical conductivity in water is mainly an indicator of what?

A slow river has dissolved oxygen of 2 mg/L on a warm summer afternoon. What does this reading suggest?

A stream sample has very high turbidity after a rainstorm. What is the most direct consequence?

A wastewater-affected creek has a BOD of 10 mg/L. What does that reading indicate?

A pond has a pH of 4.5. Which condition is most likely?

A lake sample contains 12 mg/L nitrate. What environmental concern does an elevated nitrate level raise?

A freshwater pond has 0.20 mg/L phosphate. What process can this nutrient support?

A coldwater trout stream reaches 24 °C during summer. What effect is most likely?

A stream's conductivity is 1,500 µS/cm, far above its usual background level. What does this most directly indicate?

Upstream of an outfall, nitrate and phosphate are low and dissolved oxygen is high. Downstream, nutrients rise sharply while dissolved oxygen falls. What is the likely source?

After construction begins beside a creek, turbidity rises downstream after storms, but nitrate and phosphate remain near upstream values. What is the most likely cause?

Below a power plant's cooling-water discharge, stream temperature rises and dissolved oxygen falls compared with upstream. What caused this pattern?

Below an overflow pipe, BOD and fecal coliform counts rise while dissolved oxygen falls. What pollution source best fits the data?

During winter, conductivity and chloride both increase in a creek after each snowstorm, while nitrate changes little. What is the likely cause?

Below a pile of exposed, pyrite-rich waste rock, a stream has lower pH and higher conductivity than upstream. Which source most likely produced this pattern?

After heavy rain, nitrate rises in a stream below a cornfield, while conductivity changes only slightly. What is the most likely source?

A pond has high chlorophyll, high pH in late afternoon, and dissolved oxygen that falls to 3 mg/L before dawn. What most likely explains the daily pattern?

A stream's turbidity and BOD both rise below a cattle pasture after rainfall, and dissolved oxygen falls. What source best explains all three changes?

A kick sample from a rocky stream contains many mayfly and stonefly larvae and few aquatic worms. What does this community indicate?

A stream sample is dominated by tubifex worms and leeches, with few mayfly larvae. What does this indicate?

Riffle beetle larvae and stonefly larvae are common in a stream reach. What habitat condition do these indicators support?

At Site A, mayfly larvae are common. At Site B, aquatic worms and midge larvae dominate. What conclusion is best supported?

A stream community shifts from many caddisfly larvae to mostly midge larvae and aquatic worms after a sewage leak. What does the shift indicate?