Because in a natural environment weathering and erosion will always be present.
The grand canyon.
Water and wind.
As of 2013 May 15, Grand Canyon still stands. Considering its size, it will take quite a bit of effort to keep the Grand Canyon from standing.
Yes, the wind and water have caused the grand canyon to become what it is today.
It would not fameosn
i don't know if this is the answer your looking for but John Powell explored the grand canyon at one point.
Yes, it is.
Yes, the Grand Canyon continues to erode and change over time due to natural processes such as weathering and the flow of the Colorado River. This erosion causes the canyon to deepen and widen gradually, making it appear to get bigger.
Yes, the Grand Canyon as we know it today would look very much like the Grand Canyon of 17 million years ago.
If I'm not mistaken, lava didn't really shape the grand canyon, the Colarado River did. It slowly eroded the rock until it is the massive canyon we know today.
Weathering and erosion of course.
Much of it comes from the melting winter snows that accumulate in the Rocky Mountains only to melt and head for the sea come spring via the Colorado River.