Because the keep eroding and eroding and mountains are sometimes made out of volcanos after they have erupted many times. take Hawaii for instance it was formed by a volcano.
Mostly when a river flows through a flat area with soft soil.
I'm Assuming you mean how long does it take for a tuna fish can to decay? Well the time wil vary depending on the temperature of the water, the mineral content and salinity of the water. If you use fresh tap water it will take a long time. Most tap water is balanced especially if you have a water softner. Now river water will take about a year or more in the mountains of california. But in the ocean it may only take a few months. It is all dependent on the impurities in the water.
There is no set time for rock formation. The time necessary for rock formation lie somewhere on a scale from hours to millions of years.
it takes 1,000- to 10,000,000 years to move a mile no glacier can move at mach 9
Mountain ranges form on previously converging boundaries and take a very long time to form into the mountains known today.
Yes, the same mountains that exist currently. (Mountains take a loooong time to form.)
Over long periods of time, soil and new sediments.
a long, long time
because its bouncing of the valleys, mountains and anything it can bouce off of
it takes a long time
Decrease, wind will eventually erode them. (Though this will take a VERY long time.)
a long time
Sea stacks form over a long period of time—thousands or even millions of years.
a long time. Acid rain and other erosion methods erode the rock to form a cave then an arch then a stack
Different minerals take different amounts of time.
A long time ago