| Term: | striations |
| Definition: | Multiple, generally parallel, linear grooves, carved by rocks frozen in the bed of a glacier into the bedrock over which it flows. Grooves of scratches found in surface rock that are the result of glacial abrasion. |
| Term: | striations |
| Definition: | Striations are the scratches etched into the rock at the bed of a glacier. Their presence indicates grinding of sand and rock particles into the bed under considerable pressure. Glacier ice alone is too soft to be a powerful rock-cutting agent. Many glaciers are armed with rock fragments embedded within the ice that are effective cutting tools. The rock-choked ice grazes over the glacier bed, removign rock obstacles and leaving the bedrock rounded and smoothed. In some places fine-grained debris polishes the bedrock to a lustrous surface finish called glacial polish. Coarser rocks may gouge scratches called striations. |
| Term: | striations |
| Definition: |
| Term: | striations |
| Definition: | Linear fine scratches formed by the abrasive effect of debris-rich ice sliding over bedrock. Intersecting sets of striae are formed as stones are rotated, or if the direction of flow over bedrock changes. Or Striae |
| Term: | striations |
| Definition: | Easily recognizable convex growth feature across facets or crystal surfaces. |