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Which one of the following is the correct sequence of ecosystem in the order of decreasing productivity?
The well through which water comes out through hydraulic pressure is called:
The soils which are rich in Calcium are known as:
Density of the earth’s atmosphere is highest in the:
The sphere of living matter together with water, air and soil on the surface of the earth is known as:
‘Flash floods’ are associated with:
Mounds of sand formed by wind action are called:
Plantation of trees on a large scale to check soil erosion are called:
Which of the following statements is correct?
The approximate circumference of the Earth is