Which of the following two physical components do the sun and the earth have in common?

1. core and mantle
2. core and atmosphere
3. crust and atmosphere
4. mantle and crust

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

the answer is d. none of the above