Question

1. which type of seismic wave is the first to reach a seismograph after an earthquake?

a) s wave
b) surface wave
c) p wave
d) rayleigh wave

1. what do s waves do when they encounter a liquid layer inside the earth?

a) speed up
b) stop and do not pass through
c) slow down but keep going
d) change into p waves

1. which instrument is used by scientists to measure and record seismic waves?

a) microscope
b) barometer
c) seismograph
d) thermometer

Explanation:

1. P - waves are the fastest seismic waves and thus the first to reach a seismograph after an earthquake.
2. S - waves are shear waves and cannot travel through liquids as there is no shear strength in liquids, so they stop.
3. A seismograph is specifically designed to measure and record seismic waves.

Answer:

1. C. P wave
2. B. Stop and do not pass through
3. C. Seismograph