Question

Define the following
(i) Earthing
(ii) Seismograph
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Answer 1

Answer:

Earthing:- The process of releasing excess electric charges from a charged body into the earth is called earthing.

Seismogram:- A graphical output from a seismograph, showing seismic activity of plates of Earth is called a seismogram.

Explanation:

Answer 2

Explanation:

Any of various instruments for measuring and recording the vibrations of earthquakes.

seismometer is an instrument that responds to ground motions, such as caused by earthquakes, volcanic eruptions, and explosions. Seismometers are usually combined with a timing device and a recording device to form a seismograph.

Seismograph was invented in 132 A.D. by the Chinese astronomer and mathematician Chang Heng. He called it an "earthquake