Hail can only help create rivers. It doesn't hail as often as it rains or snows, which comprises the majority of the water that flows to form rivers. However, when it does hail, the hail will melt and join the downward flow of water that creates rivers.
yes
rain hail snow thunder lightning
Precipitation.
it helps it rain, snow, sleet,hail. it causes rivers and oceand, ect. you know.
All river water comes from rain or snow (or hail) precipitation, Which comes from clouds, which comes from water bodies which are filled from rivers and rain or snow (or hail) precipitation, etc.
Prime examples would be the Oceans, lakes, rivers, streams, rain, snow, hail, sleet.
Most often, hail may form because of the updraft that a storm will create. The attached links will give you more information on hail and tornadoes.
Erosion
Tornadoes themselves are not the cause of hail, thunderstorms are. In order to produce hail a storm must have a strong updraft to keep hailstones in the air as they form and a fairly large amount of turbulence to create the cycle that forms hail. Tornadoes also need a strong updraft to form but also need other factors such as rotation in the storm to form, but this rotation isn't needed for hail.
I don't know wut da hail
escarpments create waterfalls.
They Create Deltas.