King Herod wanted to kill Jesus. He wanted to kill him because the wise men/magi called Jesus the "King of the Jews". Herod did not want anyone to take that postition away from him, so he ordered that all baby boys be killed.
The size follows like this:
6km> 60m> 600cm = 6000mm
The reason for this is that 1km = 1000m
and that 100cm is 1m
and 100mm is 1 cm
if you then calculate this:
it would be 6000m vs 60m vs 6m vs 6m :)
I think the answer to this question is mountains
The answer is its own waste