metal
It does indeed reflect the suns rays.
About 17% of the suns rays get absorbed into our atmosphere
Because white reflects heat whilst black absorbs it therefore a white roof will keep the house cooler as the suns rays will bounce back off of it whereas a black roof will absorb the suns rays.
Black Shirt because it absorbs the suns rays (aka heat) while the white shirt reflects it
The thing which protects us from suns UV rays is the ozone. It is an allotrope of oxygen element.
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They live in the desert. Normally their tunics are white or some other light color lightweight linen or cotton. The reason for the color white is that it reflects more of the suns rays than darker colors would, and helps to keep them cool.
800 km
Fire.
Well when the suns rays hits our Earths atmosphere, the suns rays scatter across the world nearly and becomes blue skies...