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.
Third Estate.
Fourth Estate.
First Estate.
B. overestimate; underestimate
C. overestimate; overestimate
D. underestimate; underestimate
C. Pell Grant
D. None of the above
b. gamma rays
c. nuclei