Scientists and engineers have puzzled over this phenomenon for many years, but only recently did a group of scientists (Stephen W. Morris of the University of Toronto and Nicolas Taberlet and Jim N. McElwaine of the University of Cambridge) actually perform controlled studies on how washboarding forms. The result of their studies showed that even with the most regular of dirt/sand surfaces, there are irregularities in the road that cause the wheel to bump. As the wheel rises, it pushes some of the road grains ahead of itself, creating a small ridge. After the bump, the wheel strikes the road surface just a little harder than normal, causing the dirt/gravel to shift forward, creating a little dip and pushing some of the grit into new ridges, which the wheel then has to rise over--which causes the next bump, etc. etc. It doesn't take many passes by vehicles to get a long row of ridges, and your washboard is born. It isn't just hills, but curves, straight sections or any part of any kind of dirt road. There's nothing that can be done about this, except call the graders and smooth the road out again. And keep your shocks in good repair!
yes
yes,ants can hatch in the dirt because they live in ant hill ,and the ant hill is underground
If you mean a ski slope, they are called Moguls.
It is made of dirt and termite saliva.
A hill is usually made out of dirt. But a mountain is made out of rock and soil and is much taller.
The cast of Dirt Dauber - 2009 includes: Lyon Forrest Hill as Passenger
Soil,Dirt,or Sand any substance that can be a good qaulity home to build a hill for digging underground.
A large bump on the ground consisting of dirt and normally covered with grass.
Turkey hill
it's called an ant hill lol :D
In a burrow they dig on the side of a dirt hill/cliff. Not tall ones though.
They live in dirt and form thier ant hills to live in.