Abrasion
Obsidian is a natural volcanic glass with potentially sharp fracture edges.
Waves. The rolling and abrasion of sand flowing over the surfaces takes oof sharp edges and rough areas, eventually grinding and polishing to rounded surfaces.
Obsidian.
breccia
a dark shadow with sharp edges (vertaling: kern schaduw)
The gradual rounding of the corners and edges of angular blocks of rock is called weathering. Weathering is the process by which rocks and minerals are broken down into smaller pieces over time due to exposure to the elements, such as wind, water, and temperature changes. This process causes the sharp edges and corners of rocks to become smoother and rounded.
erosion -help i helped a lot :)
Young mountains have sharp edges because they have not been worn down by erosion. Old mountains are rounded and smoother.
Sharp edges are knocked off by the tumbling effect created by moving water, much as a mechanical rock polisher does via a rotating drum. As more and more sharp edges are rounded, and as the rock is abraded by much smaller rock particles being transported by running water, the effect is a rounded smoothed rock surface.
No, vertices do not have to be pointed out. Vertices are the points where the edges of a shape or object meet. They can be sharp or rounded, depending on the shape or object.
Knives and scissors have edges to cut things, but nails do not have sharp edges, they have points to penetrate hard surfaces.
Obsidian is a natural volcanic glass with potentially sharp fracture edges.
Those edges can be sharp as knives or razor blades and will be hazardous until they are fire polished. Fire polishing melts the edge enough so that it forms a smooth and rounded surface.
The rocks are frozen solid therefore there Sharp edges are not lost
Diffraction is the bending of signal at the sharp edges of the obstacles. Because of the wave nature of the signal the phenomenon of diffraction becomes possible
The main causes are: Lack of concentration, and not wearing protective personal equipment (PPE), while working with metal sheets that have sharp edges.
shark