Final answer:
Research into the incidence of cancer in proximity to power lines assesses a possible health risk, but studies show no significant link between power line fields and cancer.
Step-by-step explanation:
The incidence of cancer in people living within 100 yards of overhead power lines can be best described as a health-related study. This investigation looks into potential correlations between cancer incidence and exposure to the electromagnetic fields produced by power lines. However, it is crucial to note that, despite ongoing concerns, scientific research, including reports by the American Physical Society, has found no consistent, significant link between the non-ionizing radiation from high-voltage power lines and an increased risk of cancer. Thus, the observed cancer rates in individuals living near power lines are unlikely due to exposure to these fields as the emitted intensity is far too low to cause biological damage.