some suggestions for 10th class project???

Question

it shud be related to environment/physics/how we can develop something to save the environment.......

Answer 1

I saw a show once about a guy who builds houses in the desert. He recycles water by feeding it through a series of planters with different plants.

http://www.earthship.org/systems/sewage.php

You could setup something similar, bring 'gray water' from home and feed it into the system to see how the water is cleaned by natural processes.