A student builds a model to show how pollutants move through an ecosystem when the student sprays water onto the model, red color appears in the cloth and
in the water in the middle layer of marbles. Which part of the model represents
pollutants used by humans
Red powdered paint
Layer of sand
Thick cloth
Marbles

airlines i think? or a cruise boat? does this work out for u? ?

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this