Assertion: glacial erosion | /r/AtLocation | two principal ways
Facets:
value: through the abrasion of surface materials
type: MANNER
Source sentences:
text: Glacial erosion Glacial erosion occurs in two principal ways: through the abrasion of surface materials as the ice grinds over the ground (much of the abrasive action being attributable to the debris embedded in the ice along its base); and by the quarrying or plucking of rock from the glacier bed.