air mass - A bubble of air that has certain properties., front - The boundary between two air masses., density - A measurement of how compacted particles are inside a material., sinking - What objects, liquids and gasses will do with a high density., floating - What objects, liquids and gasses will do with a low density., maritime tropical - An example of an air mass that rises in the atmosphere., maritime polar - An example of an air mass that sinks in the atmosphere., mass - The weight of an object or material., volume - How much space something takes up., displacement - When the water level rises after an object is placed in it., troposphere - The layer of the atmosphere where weather occurs., mesosphere - The layer of the atmosphere where meteors burn up., stratosphere - The layer of the atmosphere above the troposphere., water vapor - Invisible water molecules that float around the troposphere., nitrogen - The dominant gas in our atmosphere.,

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