Why does coke explode when mentos is added?

1. Is the chemical reaction harmful??

2. What causes the chemical reaction??

3. does the amount of mentos added affect the explosion??

4. Does it happen to all mentos flavour??

4.1. Will the coke explode if mentos(mint) is added??

4.2. Will the coke explode if mentos(cola) is added??

4.3. Will the coke explode if mentos(strong mint) is added??

4.4. Hypothesis: