If a=1, b=2, c= so on, then what number would the capitals of south africa be?

The graph below plots the temperature and luminosity of stars on the main sequence.

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

All of the following are extrusive landforms except           a. batholiths.   b. lava plateaus.   c. shield volcanoes.   d. geysers.