What are two NATURAL effects of groundwater movement on the landscape?

I know you only need two, but here:

--Subsidence and sinkholes.

--Sinkholes and caverns.

--Waterfalls and rapids.

--Deltas and levees.

--Erosion and abrasion.

Explanation:

answer; i do believe that the correct answer is; ///mendelian genes are at specific loci on the chromosome and, in turn, segregate during meiosis;