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The temperature of water at the bottom of a large waterfall is higher than that of the water at the top because:
Grassland ecosystem has which type of biomass pyramid?
The soil water which is of the greatest importance to the plant life is:
Humus is a type of:
Alps mountain range is located in which continent?
Which imaginary line, located at zero-degree latitude, divides the earth into northern and southern hemispheres?
On which of the following date/dates, winter solstice is observed in Northern Hemisphere?
I. 21st December
II. 5th August
III. 10th January
El Nino occurs over:
The rapidly growing mass of phytoplankton covering the surface water of a lake or pond is known as:
Which one of the following rivers crosses the tropic of Capricorn twice?