ACT Science Practice Question #1223 (Hard (33)) | Test Citadel
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ACT Science Difficulty: Hard (33)

Digital ACT Science Practice Question #1223

Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.

A planetary geology team analyzes core samples from three Martian craters (Crater X, Y, and Z) to determine relative age based on impact crater density and mineral weathering: • Crater X: 142 secondary impact craters per $100\text{ km}^2$; 85% basaltic olivine intact. • Crater Y: 28 secondary impact craters per $100\text{ km}^2$; 96% basaltic olivine intact. • Crater Z: 395 secondary impact craters per $100\text{ km}^2$; 52% basaltic olivine intact. Assuming continuous, uniform meteorite bombardment over geologic time, which crater is the oldest and which is the youngest?
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Socratic AI Engine Step-by-Step Derivation
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⚡ 15-Second Desmos Speed Hack

Most craters + most weathered = oldest (Z). Fewest craters + least weathered = youngest (Y) $\rightarrow$ Choice A.

Masterclass Solution & Distractor Trap Analysis

Under constant bombardment, older surfaces accumulate a greater density of impact craters and experience more cumulative mineral weathering (lower percentage of intact olivine). Crater Z has the highest crater density (395) and lowest intac...

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

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