Arrange the layers in order from youngest to oldest.

Answer:
The correct arrangement is - 7, 8, 6, 5, 4, 3, 2, 1.
Explanation:
According to the law of superposition, the youngest layer of rock is the layer at the top and the oldest layer of the rock is at the bottom in undisturbed strata.
On the basis of this law, the correct order would be 7, 8, 6, 5, 4, 3, 2 in order of youngest to oldest, in this case, the younger rock layer 8 is due to an intrusion that comes through breaking other layers which means the other layers have already existed there.