What happens to a water particle in a wave during a single wave period?
a. it moves in the direction of the wave.
b. it moves in a half circle.
c. it moves in one complete circle.
d. it does not move.

I think C is the answer It moves in one complete circle.

I believe the answer would be C. It moves in one complete circle. Hope this helped! :)

Answer mechanical energy;

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.