Answer:
A pure substance is made up of only one ingredient or combination. A mixture is made up of two or maybe more separate components that are not chemically linked.
Explanation:
A chemical change can also be called a chemical reaction
Shifting plates, underwater volcanoes. many different variables come in play
A. would not help and maybe make it harder to get accurate measurements.
b. would make more delta T which will improve its accuracy
c. will also increase delta T.
