2. The five boxes below represent a geologic cross-section with five layers that represent the rocks as they would from when earth’s atmosphere was developing (A is on top and E is on the bottom). Label the cross section with the appropriate rock from the word bank below. Then, explain your answer in relation to the history of the earth’s atmosphere. Answer: A B C D E Word Bank Limestone Layers, Banded-Iron Formations, Metamorphic rocks with fine grains, Red beds, Chert layers