differentiate between conservation and contamination

 what is greenhouse gas ?how it causes

 hi my name is marut   i have a questoin  that sea water can also be treated and can be use for many purpose so why you have not mentioned it.IT is important

 What are biodegradable substances

Please add videos on this topic.

 does the supply of UV rays from sun vary from places to places and time to time?

 what is natural resources????

 We must use sound absorbing materials. What are they?

how deforesstation can be measured?

what is acid rain ......>>>>;]

 But someday the sun is going to burst thus exausting solar power so why is it not non-renewable source?

what happens if the water is saline?

 MEANING OF GHARICAL ,FOREST OWLET,BLACKUCK

About what percent of energy comes from non-renewable resources?

what are metamorphosis