A pencil floats, a human no float, a feather floats, paper floats, ice floats, keys do not float, rocks do not float, coins do not, flip flops float. Second answer: I think you meant to ask, 'What floats and then some time later starts to sink. If that is what you meant, the answer is: There are absorbent substances which float when dry, then after absorbing water while they are floating, they increase in density and then sink.
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Objects that are less dense than the liquid they are in will float, while objects that are more dense will sink. Materials such as wood, cork, and plastic typically float, while materials such as metal and stone usually sink.
The people who carry the floats in a parade are typically called float bearers or float handlers. They are responsible for maneuvering and guiding the float throughout the parade route.
Tar floats on the ocean because it is less dense than water. The density of tar is lower than the density of water, so it floats on the surface rather than sinking.
A grape floats in salt water because the salt makes the water denser, increasing its buoyant force. This extra buoyant force is enough to counteract the grape's weight, allowing it to float.
No, lodestones do not float as they are composed of the mineral magnetite, which is a dense material. Lodestones will sink when placed in water.
Bark floats in water because it is less dense than water. The structure of bark contains air pockets that make it buoyant, causing it to float on the surface of the water rather than sink.