Answer:
I know you only need two, but here:
--Subsidence and sinkholes.
--Sinkholes and caverns.
--Waterfalls and rapids.
--Deltas and levees.
--Erosion and abrasion.
Explanation:
Corpus callosum <span>is the thick band of neurons that connects cerebral hemispheres</span>
Grana (plural) are stacks of flattened sacs
It's granum if it's singular
And those flattened sacs are called thylakoids, which contain chlorophyll