plain

And one day when Ingram was walking along the plains, something flew over his head and I was like, “What the f— is that?”

That isn’t the case in the high plains of Amarillo.

"It's really important to understand whether or not there are other ice plain areas that would be susceptible to this kind of retreat and calving," Dr Ochwat added.

To witness its effects, the BBC travelled from the mountains of the north to the plains of the south for three months.

The resulting 1978 masterpiece—sublimely detailed and marvelously strange in its presentation of unseen ridges, troughs and endless plains—reflected the newly established theories of plate tectonics and continental drift.