Question

this preserved piece of the delta floor from western indiana shows how animals lived and died together. it also shows us that at one time western indiana was ____________ and wave action covered this area of the delta with sediments, preserving the life story of these organisms in the fossil record.
a high in the mountains
b periodically glaciated
c on the edge of the ocean

Explanation:

Deltas form at the edges of oceans (or large bodies of water) where rivers deposit sediment, and wave action can cover the area with sediments to preserve fossils. Mountainous and glaciated environments do not form deltas with this type of fossil preservation via wave action.

Answer:

C. on the edge of the ocean