Seismometers measure

a. body and surface waves
b. ocean waves
c. sound waves
d. electromagnetic waves

b, ocean waves

Explanation:

seismometer are used by seismologists to measure and record seismic waves, by studying seismic waves,geologists can map the interior of the earth, and measure and locate earthquakes and others ground motions,the term seismograph is usually interchangeable but seismometer seems to be a more common usage

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

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