Question

which statement describes how geologists use data from seismographs to learn about earthquakes? they often compare information from all over the world. they map the location of an earthquakes focus. they use one reading to determine the location of an epicenter. they measure the difference between the arrival times of surface waves.

Explanation:

Geologists compare seismic - data from multiple seismographs around the world to understand earthquakes better. Mapping the focus is not the main use of seismograph data for this purpose. One reading is not sufficient to determine the epicenter. Measuring surface - wave arrival time differences is not the main way seismograph data is used to study earthquakes.

Answer:

They often compare information from all over the world.