Final answer:
The examples in A, C, and D are natural formation processes, while B and E are cultural formation processes.
Step-by-step explanation:
A. Deposition of sediment in a riverbed - Natural formation process
B. A pottery shard being broken and discarded by a prehistoric civilization - Cultural formation process
C. A tree falling and being buried in a forest - Natural formation process
D. Formation of a stalactite in a limestone cave - Natural formation process
E. Human construction of a landfill burying waste materials - Cultural formation process
Cultural formation processes involve human activities such as pottery-making and landfill construction. Natural formation processes, on the other hand, occur in nature without direct human intervention, like the deposition of sediment in a riverbed, the falling and burial of a tree in a forest, and the formation of stalactites in caves.