Which type of rock forms only from the solidification of magma?

igneous rock

Explanation:

Look at the chart metamorphic rock melts turning into magma magma solidifies into IGNEOUS ROCK

answer; /// the correct )

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.