Why does heat cause a substance to expand?

i. heat causes the substance's atoms or molecules to move faster.
ii. the substance gets larger because it converts heat to mass.
iii. heat drives water into the spaces between atoms or molecules.

the answer would be c

volts times amps 6 x 0.5 3w

c because the news are a source of information of things that happen on the daily and shows evidence about that particular topic

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures