Which statements describes a seismograph? check all that apply it has a curved graphing surface. it is used to locate an earthquakes epicenter, it uses a needle on graph paper to measure seismic wave activity, it determines the arrival time of p waves, or measures data used to find the difference between the arrival times of surface waves.

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point