How do glacial grooves form?
Glacial grooves and striations are gouged or scratched into bedrock as the glacier moves downstream. Boulders and coarse gravel get trapped under the glacial ice, and abrade the land as the glacier pushes and pulls them along.
What is a glacier groove?
grooves or gouges cut into the bedrock by gravel and rocks carried by glacial ice and meltwater; also called glacial striations. Parallel striations and bedrock fracture trends (across the left side of the image) are clearly visible in this photo. …
What do glacial striations tell you?
Glacial striations or striae are scratches or gouges cut into bedrock by glacial abrasion. As well as indicating the direction of flow of the glacial ice, the depth and extent of weathering of the striations may be used to estimate the duration of post-glacier exposure of the rock.
Is a erratic erosion or deposition?
In geology, an erratic is material moved by geologic forces from one location to another, usually by a glacier. Erratics are formed by glacial ice erosion resulting from the movement of ice. Glaciers erode by multiple processes: abrasion/scouring, plucking, ice thrusting and glacially-induced spalling.
What causes striation?
The striations are caused by the regular arrangement of contractile proteins (actin and myosin). Actin is a globular contractile protein that interacts with myosin for muscle contraction. Skeletal muscle also has multiple nuclei present in a single cell.
What is another word for striated?
What is another word for striated?
| striped | banded |
|---|---|
| barred | stripy |
| streaky | lined |
| streaked | variegated |
| ruled | veined |
What is a striation science?
Striations are lines or scratches on rock surfaces, usually no more than a few millimeters in depth, produced by the process of glacial abrasion (Glasser and Bennett, 2004).
What does Moraine mean?
A moraine is material left behind by a moving glacier. This material is usually soil and rock. Just as rivers carry along all sorts of debris and silt that eventually builds up to form deltas, glaciers transport all sorts of dirt and boulders that build up to form moraines.