Some students studied the layers of rock in a hill. They measured the thickness of the rock layers, identified the rock type, and collected fossils from each rock layer. Which is the best data that students could use to help identify the geologic time period of each rock layer?
A the thickness of each layer
B the type of rock of each layer
C the type of fossils in each layer
D the number of fossils in each layer




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A. the thickness of the layer


공원 태연 / TaengPark