Question

the cross section below represents the oceanic crust found on both sides of the mid - atlantic ridge. samples of crust were collected at points x, y, and z shown on the diagram. which sequence correctly lists the crust samples from youngest to oldest? choose 1 answer: a ( y
ightarrow x
ightarrow z ) b ( y
ightarrow z
ightarrow x ) c ( z
ightarrow x
ightarrow y ) d ( z
ightarrow y
ightarrow x )

Explanation:

At mid-ocean ridges like the Mid-Atlantic Ridge, new oceanic crust forms from magma upwelling. The crust becomes older as it moves away from the ridge. Point Y is at the ridge (0 km distance, youngest), Point X is 20 km from the ridge, and Point Z is 60 km from the ridge (farthest, oldest). So the order from youngest to oldest is Y, then X, then Z.

Answer:

A. $Y
ightarrow X
ightarrow Z$