The density of water at 21oC (room temperature) is 1.0 g/mL or 1.0 kg/L. If a material is less dense than water, it will float.  If a material is more dense than water, it will sink. Consider the following household items.  Determine if they will or will float or sink in water at 21oC.  If you aren't sure, try it out for yourself!  Then decide if the material is more or less dense than water. Household Item Toothpick: float Wood is [选择] less more dense than water. Ice: [选择] float sink Ice is [选择] more less dense than water. Penny: sink A penny is [选择] more less dense than water.  多重下拉选择题

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You are given the following experiment to observe:  An ice cube of frozen water is placed into two beakers of clear liquid.  In liquid A, the ice cube floats.  In liquid B, the ice cube sinks.  From these observations, which of the following options correctly lists relative density from least dense to most dense?

Clark steps outside on a winter North Dakota morning and throws a rock into the lake outside his tent. He sees that the rock does not sink. Clark forms a hypothesis about the behavior of rocks and water: The colder water is, the slower a rock will sink. Choose an experiment to best test this hypothesis. [ Select ] Get samples of water at a range of temperatures and place rocks of various sizes in each one. Verify if it will sink. Get samples of water at the same temperatures and place an identical rock in each one. Verify if it will sink. Get samples of water at a range of temperatures and place an identical rock in each one. Verify if it will sink. Get samples of water at the same temperatures and place rocks of various sizes in each one. Verify if it will sink. Predict whether this experiment will prove or disprove Clark’s hypothesis. [ Select ] Clark’s hypothesis indicating a continuous relationship would be disproved Clark’s hypothesis indicating a continuous relationship would be proved Clark’s hypothesis indicating a continuous relationship cannot be proved or disproved, If it would be disproved, what would be the revised hypothesis? Below 0°C, rocks do not sink in water.

Which of the following trees corresponds to a potential parse of the ambiguous sentence below, with correct syntactic categories? Some diagnostics are provided.

Which of the following sentences contain two non-finite verbs? Select all that apply.

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