Deep lead mining is a form of underground mining. Deep leads are old riverbeds that have become buried.
The Grand Canyon is a surface feature formed by water erosion. All riverbeds are formed by water erosion. Hoodoos are formed by water erosion.
Alluvial diamonds are those found under water having been washed away from the volcanic pipe where they erupted from the earth's mantle by flowing water. You can find alluvial diamonds in riverbeds or in the sea.
geographic position. if you have, theoretically, multiples the same rock and place them all across the earth (beaches, deserts, riverbeds, snow-capped mountains) they are going to weather in different ways and at different rates
because they are in the river
riverbeds alone the shore
Riverbeds are most commonly made of small little pebbles that have been moved around from the current of the river. It is also made up of dirt and small pieces of gravel and rocks. Riverbeds never stay the same they are always changing.
known as a wadi
Some riverbeds might be disappearing in America along with land due to construction. But there are some that are too big to destroy to build homes, so some are still around.
If there's grass growing there, yes.
There are dry riverbeds clearly visible in close-ups of Mars.