hard · Enhanced ACT science
A geologist sampled ocean-floor rock at increasing distances from a mid-ocean ridge and recorded each sample's age. Distance from ridge (km): 0, 50, 100, 150, 200. Rock age (million yr): 0, 2.0, 4.1, 5.9, 8.2. In a second survey on the opposite side of the same ridge, a rock 120 km away was dated at 9.6 million yr.
What does the second survey most strongly suggest when compared with the first?
- The opposite side spread away from the ridge more slowly than the first side
- the opposite side spread away from the same ridge noticeably faster than the first side did
- both sides spread at exactly the same rate away from the ridge
- rock age steadily decreases with distance from the ridge on the opposite side surveyed
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