Researchers track how a landfill changes groundwater nitrate, local asthma rates, and county zoning decisions. What field best frames this investigation?

Biologists measure how competition for nesting sites changes the populations of two bird species in an unmanaged marsh. What field best frames this study?

A community group organizes residents to persuade a city council to ban single-use plastic bags. What is this activity called?

A study compares factory sulfur dioxide emissions, nearby lichen loss, medical records, and the costs of cleaner equipment. Which field best fits the study?

Scientists test how removing a predator changes herbivore numbers and plant growth in a protected grassland. What field is primarily being studied?

Volunteers collect signatures to urge Congress to strengthen protections for endangered species. This is primarily an example of what?

A county evaluates a proposed mine by measuring stream acidity, estimating cleanup costs, and interviewing nearby residents. What field best describes the evaluation?

A team maps pavement runoff, tests creek water, and analyzes whether zoning changes could reduce flooding. Which field best fits this work?

A proposed dam study measures fish passage, sediment load, construction cost, and effects on downstream farms. What does this mix show about environmental science?

To evaluate whether air pollution affects a neighborhood, scientists compare particulate concentrations with asthma hospitalization rates. Which discipline contributes the health evidence?

Researchers use satellite images to measure forest loss and map where habitat fragmentation is increasing. Which discipline is especially useful?

A lake receives fertilizer runoff, and investigators measure nitrate and phosphate concentrations before and after a storm. Which discipline supplies these measurements?

A city compares the price of water-saving fixtures with the money households save on water bills. Which discipline is most directly involved?

Investigators model how a contaminant plume will move through layers of soil and bedrock toward wells. Which field contributes most directly?

A proposed wind farm is evaluated for electricity output, bird migration, local tax revenue, and residents' views. What does this evaluation demonstrate?

Small groups travel seasonally, hunt wild animals, gather plants, and use few permanent structures. Which societal era does this describe?

A society clears woodland for fixed fields, irrigates crops, keeps livestock, and stores grain surpluses. Which era does this describe?

Coal-powered factories, railroads, and rapidly growing cities replace small workshops. Which era is represented?

Farmers use satellite data and networked soil sensors to apply water and fertilizer to specific parts of a field. Which era is best represented?

Which era first let human populations grow much larger because people could produce and store food surpluses?

In which era did people first rely heavily on fossil fuels such as coal and oil as their main energy source?

Which era covers most of the time that modern humans have existed?

Which era began in the second half of the 1900s as computers and digital communication spread around the world?

A coal-fired city grows rapidly as factories replace workshops. What change in surrounding air is most likely?

In a dry region, farmers repeatedly irrigate fields with water that evaporates quickly. What soil problem is likely to increase?

A shared pasture has no grazing limits, so each herder adds animals for personal benefit until vegetation is depleted. What concept describes this outcome?

A coastal community removes mangroves to build resorts. During later storms, what environmental service is reduced?

A farmer uses soil-test results to apply fertilizer only where crops need it instead of spreading the same amount everywhere. What downstream effect is most likely?

A city replaces wasteful streetlights with efficient models that provide the same illumination using less electricity. Which sustainability outcome follows most directly?

A forest is cleared for roads and housing, dividing one large habitat into many small patches separated by development. What change is most likely for forest wildlife?