Ответ:

1.Fireworks contain gunpowder and chemicals that produce different colors when burned.

2.When someone lights the fuse of a firework, the heat from the burning fuse ignites the gunpowder inside the firework, causing a rapid combustion reaction that creates gas and heat.

3.The beautiful colors in fireworks are created by different chemicals that are added to the gunpowder, which produce various colors when they burn.

4.Some fireworks make many different colors because they contain multiple layers of chemicals that burn at different temperatures, creating a range of colors and effects.