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The main source of usable water on the Earth is:
Sink hole is a phenomenon of:
Global warming is expected to result in:
Which of the following sea has highest salinity?
The sphere of living matter together with water, air and soil on the surface of the earth is known as:
Recharging of water table depends on:
A biome is:
The sunlight is available 24 hours on the longest day at which of the following latitudes of the earth?
A geyser is a spring which:
Coffee is a: