Question

why is there sand in
this sparkler???

Answer 1

Here is your ans.-

there is sand in half part of all the spaklers ,
to prevent the lower part from catching fire , from where we use to touch hold the spaklers.

Sand is usually used because it doesn't catch fire and it also very cheap and easily available.

Answer 2

Answer:

$\huge\underbrace\mathcal\purple{ANSWER}$...

On many beaches, most of the sand (not including seashells) is made of the minerals quartz and feldspar. ... The flat flakes will lie on the surface of the beach, and on a sunny day when the grains catch the light angle off the beach, a sparkle is produced, especially in the wave swash zone.