Earth science

the five boxes below represent a geologic cross-cut with five layers (a is on top and e is on the bottom). the types of rocks are listed on the right side. in each box, write the appropriate type of rock and explain the answer in relation to the history of the earth’s atmosphere.

a

b

c

d

e

chert layers

red beds

metamorphic rocks with fine grains

banded-iron formations

limestone layers