1. in your own words, describe density. you could include words like molecules or particles, mass and volume.

Density is how the term given for the measure of how close together elements/molecules/particles are for any given thing.  For instance, a fog that is so thick that it can hardly be seen through is so because the water molecules of the fog are so close together and compact.  This type of fog would be considered thick or considered as a fog with high density.

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