c. chemical reaction.
b. chemical change.
d. physical change. Please select the best answer from the choices provided A B C D
Grinding quartz crystals down to produce sand is an example of a physical change. Correct answer: D Physical change is a change of the form of a chemical substance, but not its chemical composition. And this is exactly what grinding quartz crystals is. A physical change differs from a chemical change in that new substances are formed.
bandura claims that people are most likely to attend to attractive models