A classmate states that igneous rock must always become a sedimentary rock next, according to the rock cycle. Explain why this is not correct.

Answer 1

Igneous gets spewed hot from the earth and solidifies as it cools.

Sedimentary is deposited cool from oceans and streams and hardens with age and pressure.

Your book must say something like that.
see:
http://geology.com/rocks/igneous-rocks.shtml
and
http://geology.about.com/cs/basics_roxmin/a/aa011804b.htm