Test: 4th Grade Science

1.

Miranda's class was investigating how weathering affected the rate of erosion. They put chunks of bar soap in an aluminum foil tray and filled it about halfway with water. They measured the soap after soaking for about three hours and then sprayed the bar of soap with a squeeze bottle full of water. They observed bits of soap breaking off and floating in the water. They took final measurements and recorded them in the data chart below.

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Based on this data, what had the most significant effect on the soap?

Soaking the bar of soap

Scraping the bar of soap

The effect is the same on the bar of soap

Spraying the bar of soap

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