What evidence might suggest a time interval between two rock layers?
A) a metamorphosed band in the bottom layer
B) a metamorphosed band in the top layer
C) a coal layer between the two layers
D) an irregular boundary between the two layers
Question 2
What did William Smith correlate while researching coal mines in Britain?
A) fossils in different layers in the same mine
B) fossils in the same layers in different mines
C) composition of coal seams in different mines
D) types of rock layers in different mines
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