Question

How does evidence that rocks farther from a ridge are older rocks closer to the support the idea of spreading?

Answer 1

As the rock spreads over time, the older rocks are pushed away from the margin.

Explanation:

Just like pulling a towel from a washing machine, the part of the towel that comes out first is furthest from the machine. Plate boundaries do the same, but on both sides of the boundary simultaneously. The diagram here may help:

Taken from:
discoveringgalapagos.org.uk/wp-content/uploads/2014/07/g2a1_constructive-edit2