What is seismograph
The instrument which detects and then records the intensity of seismic waves generated by an earthquake is called seismograph.
Ala ud din khilji
ʿAlāʾ ud-Dīn Khaljī, born as Ali Gurshasp, was the most powerful emperor of the Khalji dynasty that ruled the Delhi Sultanate in the Indian subcontinent. Alauddin instituted a number of significant administrative changes, related to revenues, price controls, and society. Born: 1266, Died: January 1316,
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