STAAR Science Practice Questions - State Of Texas Assessments Of Academic Readiness (STAAR) Science Exam

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Students model erosion by pouring the same amount of water over trays of sand. Tray A is bare sand, Tray B has plastic mesh pressed into the sand, and Tray C has small pebbles on top. Which change would best improve the investigation's reliability?

Use a different water amount for each tray so every tray looks realistic Record only the tray that loses the most sand Repeat each tray setup several times and compare the average amount of sand moved Replace the sand with soil halfway through the investigation

Correct Answer:

Repeat each tray setup several times and compare the average amount of sand moved

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