Question: The sand and flour in the gray material from mock rocks is separated by mixing with water and allowing the mixture to settle. Explain why the sand and flour separate.
Reference answer: The sand particles are larger and settle first. The flour particles are smaller and therefore settle more slowly.

Student answer: One is heavier than another see it settles in how many layers there is ingredients.

Student answer: Because the sand is heavier.

Student answer: Because the sand is the heaviest and the sand would go to the bottom.

Student answer: We shook it up and sand is heavier than water so it went to the bottom.

Student answer: The sand and flour separate because sand is heavier than flour.

Student answer: Evaporating separates the 2.

Student answer: Sand and water have different size particles and they stick together.

Student answer: The sand and salt weigh different, one is big one is little.

Student answer: Because the water dissolves separates the sand and flour, and they group with their sister minerals that are same size.

Student answer: The sand is heavier than the flour.

Student answer: The sand and flour separate because the sand is heavier than the flour, so the flour goes to the top and the sand sinks.

Student answer: They are a soft substance that disintegrates when it mixes with water.

Student answer: They separate because the sand is heavier than the flour.

Student answer: The sand and flour separate because sand floats to the top and the flour stays on the bottom.

Student answer: I think the sand is on the bottom because it is heavy and the flour is in the water because it is smaller and does not weigh a lot.

Student answer: It separated because the sand sank below the flour and the flour stayed on top.

Student answer: The sand is harder then the flour so that is that is why they separate.

Student answer: They separate because the water made them into layers. That is why they separated.

Student answer: The sand and the flour separate because the sand is heavier and it sinks to the bottom and the flour is lighter and goes on top of the sand.

Student answer: They separate because the water makes them into layers by making water onto sand in middle and gray material on bottom.

Student answer: It separates because of the water.

Student answer: The sand is the heaviest one because it is more heavier than the flour.

Student answer: Because sand is heavier than flour.

Student answer: Because the sand way too heavy when we put in the water, but the flour was the opposite! Because the sand was too heavy to float in the cold acid like the flour.

Student answer: Because the sand is big so it goes on the bottom and the flour is small so it goes on the top of the sand.

Student answer: Because the sand is heavier than the flour so the sand fell to the bottom before the flour had a chance to fall down and what is heavier falls down faster.

Student answer: If you put the sand then the flour then the gray materials then the water the gray materials speeds the sand and the flour.

Student answer: By dissolving and in water the sand moves around in it.

Student answer: Because when the rock breaks. They break into pieces that land heavier from gets.

Student answer: Because the flour was lighter than the sand.

Student answer: Because the sand is heavy and flour is light.

Student answer: Sand and flour separate because sand is heavier than flour.

Student answer: The sand is heavier than flour the sand goes down because it is heavy the flour is light.

Student answer: There is layers and on the top there is flour because the heavy and the bottom is the sand because sand heavier and it goes down.

Student answer: Because if you let it sit the sand goes to the bottom and flour goes up.