The energy of a machine that is transformed into heat: is destroyed
can always be used for additional work
usually cannot do any further work
can be transformed back into mechanical energy

It was crowded with sewer like smells. bad sewer systems

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.