Question

mid - atlantic ridge
which sequence correctly lists the crust samples from youngest to oldest?
choose 1 answer:
a ( x
ightarrow y
ightarrow z )
b ( x
ightarrow z
ightarrow y )
c ( y
ightarrow x
ightarrow z )
d ( y
ightarrow z
ightarrow x )

Explanation:

At mid - ocean ridges (like the Mid - Atlantic Ridge), new crust is formed. The closer a crust sample is to the ridge, the younger it is. Sample \(Y\) is at the ridge (\(0\) km distance), so it is the youngest. Sample \(Z\) is at \(20\) km distance from the ridge, and sample \(X\) is at \(60\) km distance from the ridge. So the order from youngest to oldest is \(Y\) (youngest) \(\to Z\to X\) (oldest).

Answer:

D. \(Y\to Z\to X\)