What is an astronomical unit (AU)? A: the diameter of the Sun
B: the radius of the Sun
C: the average distance between Earth and its moon
D: the average distance between Earth and the Sun

D

Explanation:

the AU is the distance between the earth and the sun

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d

i really dont know but i will try okay.

so i think u would just add all them up and get your answer..