expand - to get bigger: take up more space, contract - to get smaller: take up less space, sink - to go under water as a result of being denser than water, float - to stay on the surface of water as a result of being less dense than water, denser - when an object sinks it is denser than water, less dense - when an object floats it is less dense than water, water - a liquid earth material made of hydrogen and oxygen, property - a characteristic of a material or an object; something you can observe such as color, smell and taste, absorb - when water soaks into another material, beads - when liquid sits on top of a material in drops, surface tension - skin-like surface on water (and other liquids) that pulls it together into the smallest possible area (sphere), dome - shape a drop of water takes when it is on a flat surface. It is like a flattened hemisphere.,

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