Aluminum can. Copper sheeting, silver spoon, wood drumstick, brick house, Which objects are flexible?

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

20 drops hope this

it is the most commonly accepted one