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 earthquake’s focus. they use one reading to determine the location of an epicenter. they measure the difference between the arrival times of surface waves.

They often compare information from all over the world.

Explanation:

The geologists measure the traveltime difference between P and S waves and from travel-time curves and standard travel-time tables they can estimate the earthquake location but only one seismographic info is not enough, we need at least 3 stations to come we a valid model (because one station only gives a radius of influence), this means that data from all over the world must be compare in order to get a precise information of the earthquake location

A

Explanation:

did the quiz

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c) both a and b.