the geologic cross - section diagram shows undisturbed rock layers with index fossils from two regions (a…

the geologic cross - section diagram shows undisturbed rock layers with index fossils from two regions (a and b). the two index species are identified in the index fossil key.\n\nwhat answer option correctly describes the relative ages of the rock layers in the diagram?\n- layer 6 is older than layer 3;\n- layer 2 is younger than layer 4.\n- layer 6 is older than layer 3;\n- layers 2 and 4 are the same age.\n- layer 6 is younger than layer 3;\n- layers 2 and 4 are the same age.

the geologic cross - section diagram shows undisturbed rock layers with index fossils from two regions (a and b). the two index species are identified in the index fossil key.\n\nwhat answer option correctly describes the relative ages of the rock layers in the diagram?\n- layer 6 is older than layer 3;\n- layer 2 is younger than layer 4.\n- layer 6 is older than layer 3;\n- layers 2 and 4 are the same age.\n- layer 6 is younger than layer 3;\n- layers 2 and 4 are the same age.

Answer

Brief Explanations:

Relative age determination uses the principle of superposition (older layers beneath younger ones) and index fossils (same fossils indicate same age). In the diagram, layer 6 is below layer 3, making it older. Layers 2 and 4 share the same fossil, meaning they formed at the same time.

Answer:

Layer 6 is older than layer 3; Layers 2 and 4 are the same age.