An environmental scientist is investigating the factors contributing to the severity of recent forest fires in a national park. She conducts field measurements at several recently burned sites, recording the soil moisture levels and charred organic matter thickness herself. She also obtains historical climate records (temperature and precipitation) from the national meteorological bureau's open database and satellite vegetation density maps from the European Space Agency's public archives.
Referring to this investigation, explain the difference between primary and secondary data.
235 exam-style questions on AQA A Level Psychology Data handling and analysis. Each one has a worked solution and a mark scheme showing where the marks go.