Complete the sentence.
An igneous rock becoming a metamorphic rock is a ().
A: physical change
B: chemical change
An igneous rock becoming a metamorphic rock is a chemical change. Over millions of years, heat and pressure can break the chemical bonds in the molecules of the igneous rock.
When this happens, a new rock with different molecules is formed. The metamorphic rock is made up of a different type of matter than the igneous rock.