It is one kilometre wide by a kilometre and a half long and the chicks are protected from predators by electrified wire fencing.
What he calls a crack is more like a canyon, at least 300 metres deep up to a kilometre long yet only a metre wide.
The event consisted of a five and ten kilometre run and walk as well as a one kilometre for the very young, the old and the not so fit.
They will move around about a quarter of a kilometre an hour and if you measure their rate of moving, they have small home ranges.
Islands of ice kilometers long and up to two metres thick are common here.
Once in a while, the funnel of air drops from the sky - it can be as narrow as a few metres across or as wide as two kilometres .
The appellant was informed that he had been clocked at 97 kilometers in a 50 kilometer per hour zone.
As with metres and kilometres , we need some new units, or we'd need a lot of zeroes!
Next we will be having our speedometers changed from miles per hour to kilometres per hour.
A meter is about three feet and three inches and a kilometer equals about six tenths of a mile.