Describe the force that causes volcanoes to explode

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?

What does the map above tell us about the endemity of typhoid fever

The picture above depicts the berlin wall which divided in half from the 1960 to 1989 which type of boundary was the berlin wall