Final answer:
Scientists use geophones to measure seismic waves caused by traffic and study the effects of urban life on the earth.
Step-by-step explanation:
The subject of this question is Physics. Scientists use instruments called geophones to measure seismic waves caused by traffic in order to study how urban life affects the earth. Geophones are designed to detect vibrations in the ground and provide data that helps researchers understand the impact of human activities on geological structures.
Learn more about Seismic waves