Well it depends on depth. Below a level of just a few tens of meters (if that) there is no soil...its all rock.
At the surface though its different about 70% of earth is covered by water...the rest is land surface... there is a thin layer of soil, which is pretty much decomposed rock) in most places. But the soil is missing in some areas such as steep regions and in other places such as high mountains.Inmost regions there usually is a thin covering of soil... this may only be inches to several feet deep... in some places such as flood plains it will be deeper.
You may want to get a good physical geology book from the library and begin reading it. It will go into some details and explain how soils form and other aspects of physical geology.