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The highest grade and best quality coal is:
The deepest trench of the Indian Ocean is:
Tides in the sea have stored in them:
Algae belongs to which of the following levels of the ecosystem?
Storms of gases are visible in the chromosphere of the Sun during:
Depression formed due to deflating action of winds are called:
Which of the following statements is correct?
‘Green Accounting’ means measuring the National Income of the country taking into account estimation of:
The temperature of water at the bottom of a large waterfall is higher than that of the water at the top because:
Who had used the term “Ecology” first time?