Will an object of 220 g float or sink. explain

The mass of an object won't actually be the reason whether something will sink or float, because 2 tonne boats can float.

Many factors like density, Archimedes' principle, go in to determining whether something will sink or float 

The speed of  sound:   sound travels  at different speeds depending on what it istraveling through. of the three mediums (gas, liquid, and solid)  sound waves travel the slowest through  gases, faster  through  liquids, and fastest  through  solids.

The answer is ozone layer.