Question : The method of soil conservation in which stones, grass and soil are used to build barriers to collect water is called

Question : The method of soil conservation  in which rocks are piled up to slow down the flow of water which prevents gullies and further soil loss is called?

Question : Plantation of trees on a large scale to check soil erosion are called:

Question : The soil conservation method in which mountain slope is cut into step is 

Question : The Gross domestic product (GDP) estimation method measuring the aggregate value of goods and services produced by the firms is called _______.