_are particles of light.
a. Proton
b. Electrons
c. Photons
d. Neutrons

Match the vocabulary word with its meaning

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?

Which of the following situations is most likely to arise when a crowded city is unable to provide its residents with sufficient sanitation?