6. An environmental assessment of land to be developed might describe the weather and climate, animals, vegetation, microorganisms, soils and rocks, pathways of
water, and composition of water. Briefly describe five of the fields of science that
play a role in such an environmental assessment. (10 points)

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.

answer; talc and gypsum;

there are two significant figures.