If I could I rearang the alphabet i would put mnu together

Break down of rocks and minerals into smaller particles without a change in composition is called_

According to the passage a mound is

Which source would provide the most bias-free information about smoking and increased health risks? a) a website created by heart disease patients b) a research study conducted by the mayo clinic eliminate c) a public service message sponsored by tobacco companies d) an online question forum conducted by attorneys for cardiac specialists