Question: Pete put a marble in a cup of water as shown in the picture. What evidence indicates whether the marble is more or less dense than the water?
Reference answer: The marble is on the bottom of the cup (under the water).

Student answer: My evidence is the picture. When an object is denser than water, it shrinks. The picture showed that the marble sinks, so the marble is denser than the water.

Student answer: When something is more dense than water it will sink which is what the marble did.

Student answer: Because it is a solid hard rock. But if it was ice it would not sink it would float.

Student answer: The marble is denser so the denser it is the more it sinks.

Student answer: When the red, hot water in a little cup, the water that is red goes to the bottom of the cup. When it is a little cup of blue, cold water that water stays at the top.

Student answer: When something is denser than water it sinks, and when something is less dense then it floats.

Student answer: The marble in the water is at the bottom.

Student answer: The marble is denser than the water that is why it sank.

Student answer: My evidence is that the marble sunk.

Student answer: Because a marble is heavy so it will go down.

Student answer: The marble breaks through the water surface.

Student answer: The marble sank.

Student answer: The marble is denser than the water because it has air bubbles.

Student answer: I chose C because when something sinks to the bottom it is more dense than the water.

Student answer: The marble sunk.

Student answer: Well, it sank so that means it is more dense than the water.

Student answer: The marble sinks when it is more dense.

Student answer: If the marble was less dense it would float.

Student answer: Because it was denser, so it sank.

Student answer: My evidence is that the marble is more compact than the water.

Student answer: When we dropped a wooden ball in a cup with water we discovered it was less dense.

Student answer: Because it has more stuff in it.

Student answer: The marble is denser than the water.

Student answer: No evidence.

Student answer: Because the thing that goes down is denser than the thing that stays up.

Student answer: My evidence is that the marble is sinking.

Student answer: It went to the bottom of the cup.

Student answer: My evidence is that when an object sinks it means that it is not very compact.

Student answer: My evidence is the marble was more dense than the water so it sunk.

Student answer: My evidence is the marble is denser because it sank.

Student answer: If Pete puts it in cold water it will float.

Student answer: The marble sank in the water.

Student answer: The marble is denser than the water because it sank to the bottom of the cup.

Student answer: Because the marble is more heavier than the water.

Student answer: The marble is more dense than the water because it is a solid that sinks.

Student answer: I know that denser objects sink to the bottom of the water.

Student answer: The marble is heavier than the water. The marble sunk.

Student answer: Because it sank to the bottom.

Student answer: Because the marble is at the bottom in the picture.

Student answer: The marble is denser than the water, so the marble sinks.

Student answer: The marble is more dense so that maybe it happened.

Student answer: When you hold a marble in one hand water in another you will see a marble is more heavy than the water.

Student answer: The marble is like cold water because the marble is at the bottom of the cup. There is also less air in the marble, therefore the marble is denser than water.

Student answer: The water is denser than water.

Student answer: It sinks.

Student answer: The marble is denser than the water because it goes straight down.

Student answer: It is true I did it in third grade.

Student answer: The water is cold and maybe Pete made the marble cold.

Student answer: It is less dense because it sinks.

Student answer: Because the marble is heavier.

Student answer: My evidence is that the marble is at the bottom, when an object is more dense it floats to the bottom.

Student answer: Unknown.

Student answer: The marble is at the bottom.

Student answer: It sank and items denser sink.

Student answer: It sinks.

Student answer: Because the marble sunk and when the objects sink it means it is denser.

Student answer: Whenever a matter sinks, it means that it is denser.

Student answer: It sank because the marble is denser than the water.

Student answer: Because it is heavy and if it was a little one it could float.

Student answer: Because the marble is denser than the water.

Student answer: The marble is on the bottom of the cup.

Student answer: The marble sunk to the bottom of the cup.

Student answer: When the water is denser than the marble the marble would float but it is not so the marble is denser than the water.

Student answer: Because the marble sank.

Student answer: If water is more dense than water it will sink.

Student answer: It sunk!

Student answer: Less dense means it will sink to the bottom.

Student answer: It sank. If it was less dense it would float.

Student answer: The marble is denser than the water. Because the marble is so tightly compacted and solid.

Student answer: The marble is heavy so it will sink.

Student answer: It is at the bottom of the cup.

Student answer: My evidence is because the marble is at the bottom of the cup.

Student answer: See the water is less dense and the marble is denser so that is it.

Student answer: Because the marble went to the bottom.

Student answer: Because the ball sank it is denser than the water and because it is glass.

Student answer: Because when you put the marble in the water it will sink because it is less dense.

Student answer: Because it sinks, it goes down, it is denser.

Student answer: Well if the marble was less dense or the same density the marble would not have sank.

Student answer: Just like ice when something is denser than water it will sink.

Student answer: The marble sank. When something sinks it means it is denser than the water.

Student answer: That a marble is more dense than water.

Student answer: The marble is under water and on the bottom of the cup.

Student answer: The marble starts to sink because it is heavier.

Student answer: My evidence is that all heavy things sink and all light things float.

Student answer: The marble sinks, and if it was denser it would float.

Student answer: Because things sink there are no holes in them.

Student answer: Because the marble is heavy.

Student answer: Because the water stays in the cup.

Student answer: Because it is heavy.

Student answer: It is heavy.

Student answer: Something sinks it is less dense.

Student answer: Because the smiley ball floats and a ball is heavier so it will sink.

Student answer: Because the marble is heavier then the water.

Student answer: No answer.

Student answer: The marble is more dense because it went down if it was less dense it will be floating on top of the water.

Student answer: It sank. If it was less dense it would float.

Student answer: Because a marble is heavy. The marble is all the way down.

Student answer: The marble is denser because it sank to the bottom.

Student answer: The marble is denser because it sinks.

Student answer: Because the marble sink so it is denser.