The method of soil conservation in which stones, grass, soil are used to build barriers along contours and trenches are made in front of the barriers to collect water is called?
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In which of the following situations is mechanical energy most likely to be conserved?
1 km/hr equals _____________ m/s
Sandstone is which type of rock?
Any undesirable change in physical, chemical or biological characteristics of air, land, water or soil is called?
Which one of the following is not a property of electromagnetic waves?
Through which does light travel best?
Who among the following is the executive head of state in India?