Pingos are a result of water - a lake for
instance - sited on permafrost,
where the top layer of water freezes. Because of the wind, which blows everything around,
and plant growth gather on top of the frozen water/lake and makes a 'lid'. The water between
the permafrost and the ice-earth lid will at some point freeze, and in this process it
will be pressed upward and a pingo is born.
the freezer was invented
Inuit people used pingos to store food in, somewhat like a huge "walk in" freezer.
They dug into the pingos and made chambers where they saved all the meat they collected
from hunting. Here the meat could freeze and stay fresh until they needed it again, and at
the same time it was protected from animals eating it.