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Water, over time is a very powerful force and while wind can cause erosion over time water is the main agent of erosion on this planet. The deal with the Grand canyon is that the colorado river has...

Not at all. Its a saying and a parable. If your in Italy and you were back in the day all roads did lead to Rome. Of course the street outside my house doesn't go there. Har Har.

yes but it doesn't lead to Rome.

Your exactly correct.

Like I always like to say the Grand Canyon was formed by running water with a little help from uplift.

The point is that over the years people have come to use (with...

Just about any rock can be metamorphosed like say sandstone which then becomes quartzite. Its more noticeable in effect in sedimentary rocks only because those are less dense to begin with. With...

In theory any mineral harder than steel will wear steel and can be considered as a honing medium. However its way more complicated than that. Even softer stones can be used to hone. Remember the...