how can i make working model of recycling home waste water

Define environment and its components?

Who invented cement?

how is soil erosion and spoilage of landscape inter-related

What do you mean by soil conservation

What is soil erusion?

plants need to keep their race alive by _________________

why do puris float on the oilwhile frying

 HOW CAN A BROKEN GLASS BE RECYCLED

 Why do people cut trees?

what is deforesting?

How  many  endangered  species  are  there  in  india  &  their  number. 

 how to prevent soil erosion

what is water supply?

what is petroleum