関連ワード:  what tools do scientists use    what tools do scientists use to measure earthquakes    what tools do scientists use to study earthquakes    what tools do scientists use to predict earthquakes    what tools do scientists use to date artifacts and fossils    what tools do scientists use to monitor volcanoes    what tools do scientists use to track storms    what tools do scientists use to study volcanoes    what tools do scientists use to study hurricanes    what tools do scientists use to predict the weather