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As ice needles freeze, they nudge small rocks to one side or another.

Pine needles grow their own ice needles, turning into rimed maces.

This is because ice needles have formed, pushing the soil upwards, and the pressure of a footstep crushes them down again.

It is supplied by thawing ice needles and gravity.

The punt followed the canals, cut at right angles; progress was slow, impeded by ice needles, that formed by the cold clustered on the sedges of the bank.