Where in central america is savanna vegetation found?

What is the earth matial ot igneous rock

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?

In the middle east, a blank is a dry riverbed that often fills briefly with water after strong rains