Some ocean currents are caused by differences in the density of water from place to place around the globe. what two factors cause differences in ocean water density

The density of ocean water is affected by differences in water temperature and amount of dissolved salts. Some animals use ocean currents to move from one area of the ocean to another.

h let me think

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.