Volcanoes: The color in the center of the diagram most likely changed from red to orange to
A. show the difference between the formation of the magma lava
B. Help grab the viewers attention with more than a single color
C. Give a warning with the color red that volcanoes are dangerous
D. Show how the temperature of magma changes as it rises

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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.