The wave crashes on the rock a lot causing it to wear down. If you were scribbling on a piece of paper in the same spot with a pen, eventually, there will be a hole because you wore down the paper.
Yes
the force of the rivers have worn down the rock and formed the canyons.
Conglomarate
plants help because they help to keep the soil up which in turn will keep rivers smaller and keep rocks from falling in or getting worn down as quickly.
Sediment.
weathering
sand storm
Weathering and erosion.
Rocks are worn away through the process of weathering and erosion. Weathering is the breaking down of rocks into smaller pieces while erosion is what carries the rock to new places. Rocks can be worn away by water, ice, and wind. Examples of this are abrasion, ice wedging, and dissolution.
The process of rocks being worn down and altered over time is called weathering. This can occur through physical processes (such as wind and water erosion) or chemical processes (like oxidation and hydration).
Probably because it is worn down rocks, and those are colors they tend to be
Chemical weathering means that rocks are worn down by chemical reactions. This is unrelated to gravity.