ACT Science Practice Question #1523 (Medium (32)) | Test Citadel
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ACT Science Difficulty: Medium (32)

Digital ACT Science Practice Question #1523

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Paleoclimatologists analyzed oxygen-18 (delta 18O) in an Antarctic ice core: - Modern ice (0 m depth): delta 18O = -35.0 permil - Glacial maximum ice (2,000 m depth): delta 18O = -45.5 permil Lower delta 18O values in precipitation correlate with colder air temperatures. The ice core data indicates that at 2,000 m depth:
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More negative delta 18O = colder glacial climate.

Masterclass Solution & Distractor Trap Analysis

More negative delta 18O (-45.5 permil vs -35.0 permil) reflects stronger fractionation in colder atmospheric temperatures....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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