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Pyramid of numbers in an aquatic ecosystem is .
The vertical movement of air is termed as:
The line on a map connecting points of equal temperature at a given time is:
Light from the Sun reaches us in nearly:
One of the following is not the result of underground water action:
The light from the Sun reaches the Earth in about—
Storms of gases are visible in the chromosphere of the Sun during:
Natural sources of air pollution are:
Soil formed by leaching and oxidation is:
The total number of planets revolving around the sun is: