One way to determine if a rock sample is metamorphic is by:
a. finding fossil evidence
c. noting a crystalline structure in its particles
b. noticing light and dark color bands
d. all of the above

Ascientist is explaining how background cosmic radiation gives evidence of the big bang theory. she says that radiation has been detected everywhere equally as heat in the universe and is increasing. this has been shown to be residual radiation from the big bang. what error did the scientist make?