How can one tell if an object can absorb light or not? how about transmit?
you!

Absorb:
Shine a light with known intensity into the object. 
Measure the intensity of the light that comes out.
Any light that goes in but doesn't come out the other side
   was absorbed by the object.
(Note:  You also need to be aware of any light that bounces back from
the first side without entering the object.  That light is reflected from it,
and can't be expected to show up at the other side.)

Transmit:
Any light that goes in and DOES come out the other side
   was transmitted by the object.

Nps pollution is caused by rainfall or snowmelt moving over and through the ground. nonpoint source pollution can include: excess fertilizers, herbicides and insecticides from agricultural lands and residential areas. oil, grease and toxic chemicals from urban runoff and energy production

Idont understand the question