In a solar eclipse, a. the moon is between the sun and the Earth
b. the Earth is between the moon and the sun

It's A.The moon is between the sun and the earth.

a. the moon is between the sun and the Earth

Explanation:

the aswer is letter c

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.