Divergent boundary!
you create it
The Velocity
Yes.
Cirques are formed
Several sinkholes merging to create a larger depression called a solution valley.
A valley typically is created by erosion, either by water or a glacier. I suppose a valley could also be created as two tectonic plates separate, such as the Great Rift Valley.
valley glaciers
valley glaciers
A cirque is the top of a glacier valley.
When the glacier is moving down the side of the valley it scrapes of the rocks. The grinding changes the shape of the valley so that it is rounded.
Yes. An example is Yosemite National Park.
canyon