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Obsidian is a natural volcanic glass with potentially sharp fracture edges.
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What process causes a rock with sharp edges to have rounded edges?
Abrasion
What sedimentary rock made up of rock fragments with sharp edges?
breccia
What part of a rock does weathing attack most rapidly?
Weathering attacks the surface of the rock most rapidly.
What is a extrusive rock that is actually glass?
Obsidian is an extrusive rock that is a naturally occurring volcanic glass. It occurs when lava extrudes from a quickly cooling volcano, causing little crystal growth.
What is a flint-bladed sickle?
A sickle is a tool use to cut grass or grain. Flint bladed means that it uses sharp chips of flint rock for the cutting edges.
What process causes a rock with sharp edges to have rounded edges?
Abrasion
What sedimentary rock made up of rock fragments with sharp edges?
breccia
What is a shard of wood?
The definition of a shard is a piece of broken ceramic, metal, glass, or rock, typically having sharp edges. So with that definition, I would say that a shard of wood just means a piece of broken wood having sharp edges. If you are referring to the crossword puzzle hint, the answer is splinter.
How do you know if a rock has been in a river?
The force of the water will have worn it smooth, with no sharp edges.
Will glass bottles decompose?
No. Glass bottles will undergo physical changes in the environment such as breaking or sharp edges smoothing out (think seaglass), but the natural processes of chemical decomposition doesn't work on glass. The same goes for styrofoam.
Is pumice has no grain?
Pumice is so fine grained, it actually doesn't have a grain--because it is a natural volcanic glass. The rough texture is caused by the vesicular nature of the rock--trapped pockets of gas bubbles with sharp glassy edges.
What part of a rock does weathering attack most rapidly?
The most rapid weathering occurs at the sharp edges and corners of rock.
What part of a rock does weathing attack most rapidly?
Weathering attacks the surface of the rock most rapidly.
Why do river stones round out?
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.
Is the flint rock very hard?
Yes, slithers of which, when broken from a bigger lump (known as 'knapping') have sharp cutting edges.
What are a mix of of sharp angular pebbles?
A sedimentary rock called "breccia". The sharp angular pebbles making up the breccia could be igneous, sedimentary, or metamorphic. Breccias generally form close to the point of origin of the clast rock, having less time to round those sharp angular edges.
What rocks are a mix of sharp angular pebbles?
A sedimentary rock called "breccia". The sharp angular pebbles making up the breccia could be igneous, sedimentary, or metamorphic. Breccias generally form close to the point of origin of the clast rock, having less time to round those sharp angular edges.
