1) if a star's temperature were doubled, its new luminosity would be the original luminosity.
a) 32
b) 8
c) 16
d) 2
2) the source of fuel used to make the sun shine is
a) uranium
b) oil
c) hydrogen
d) coal

¿cual es mas alta en baja california,la migracion o la inmigracion?

Which of the following mountain ranges is home to the largest mountain peak in europe? a. the carpathian mountains b. the caucasus mountains c. the balkan mountains d. the ural mountains select the best answer from the choices provided a b c d

Which of the following physical characteristics best explains the climate of the area that is circled in black on the climate map above?