Many developing and emerging countries (e. g. China and Brazil) are increasing their oil usage as their populations become more wealthy and can afford luxuries such as ——— and holidays abroad. What is the missing word

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4

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?

Seasons are a result of: a.) earths rotation on its axis b.)earths tilt on its axis c.) global air circulation patterns d.) global humidity circulation patterns