The action of ploughing in ridges. Also with up.

Geology. An upheaval of part of the earth's crust or surface; an uplift.

Geology. The action of raising, or fact of being raised, above the original level, esp. by volcanic action.

Geology. Elevation in level; an upheaval.

The action of thrusting or fact of being thrust upwards, esp. by volcanic action.

spec. An elevation or rise in level, esp. of a portion of the earth's surface.

= upheaval, n. 1.

a slow rise and fall of the earth's crust.

the raising of part of the earth's surface to form an upwarp.

The upward expansion of a rock mass into a dome shape.