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Distance is a centimeter in the CGS system. In Physics, distance is defined as the physical measurement of how far an object has moved. Distance is a scalar quantity.

Newtons laws of motion

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.