The chemical and physical actions of groundwater form

Karst topography

glacial topography

volcanic topography

mountain topography

Question

The chemical and physical actions of groundwater form

 Karst topography

 glacial topography

 volcanic topography

 mountain topography

jagatuba · Answer

Karst would be my guess by process of elimination.

jagatuba · Answer

By the questions own wording we are dealing with ground water and not glaciers, volcanoes or mountains.
Well maybe mountains, but I doubt it.

hero · Answer

@jaga, you should have defined Karst.

jagatuba · Answer

Can't. I'm a computer scientist not a geologist. Don't have a clue what Karst is.

jagatuba · Answer

I was just looking at it logically.

anonymous · Answer

So you both say Karst