Ceritakanlah dengan singkat aktivitas penduduk di daerah pegunungan

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

Ozone in the upper atmosphere has been depleted by a. sulfur dioxide. b. chlorofluorocarbons. c. carbon dioxide. d. oxygen.

Which outcome is not caused by gravitational forcea. gas and dust come together to form a planet b. planets orbit a star c. two atoms come together to form a molecule d. stars cluster to form a galaxy