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Because of gravity, and an effect gravity creates that we call weight. Substances that weigh less will rest (in liquids or gas, float) above substances that weigh more. Gravitationally significant objects, such as planets, will tend to sift their materials; heavier materials will settle lower through the lighter ones. Also, the lower materials are compressed by the weight of the material above them (which amplifies the density of the lower material); this is why despite it all being made of seawater, pressure at lower ocean depths is much greater than the pressure of ocean water near the surface and also why air is thinner the higher in altitude you go -- in oceans, the bottommost oceanwater is compressed by the weight of all the ocean water above it and in the atmosphere, the air at the surface is compressed to the air pressure we are familiar with by the weight of the atmosphere above.

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