Heaving

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1. A swelling or rising of the surface; the freezing and thawing action of frost which sometimes dislodges the crown of a plant leaving it partially or fully exposed above the soil line.

frost_heaving01.jpg

frost_heaving02.jpg

Example of soil that has heaved up and then been pressed back down.
Source: http://www.savvygardener.com/Features/frost_heaving.html