Define these terms. Seismograph, Seismic wave, Seismology and Tectonic plate
(a) Seismograph: A type of instrument used to measure earthquake.
(b) Seismic wave: The shock wave produced by earthquake.
(c) Seismology: The branch of science deeling with earthquake and related problem is called Seismology.
(d) Tectonic plate: The crust layer of earth is made up of a number of rocky slabs called tectonic plates.