Why does zz make the t sound in pizza and Iezzi?

Answer 1

Because the words come from Italian, where zz is usually pronounced "ts".

Answer 2

The letter combination "zz" in words like Pizza and Iezzi makes the "ts" sound because it follows the Italian pronunciation rules where "z" is pronounced "ts" in certain positions within a word. This is why you hear the "ts" sound in these words instead of the individual sounds of "z" and "z."