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The largest ecosystem of the Earth is:
Echo sounding is the technique applied to—
A place where there is constant intermingling of salt water and fresh water is
Which one of the following is the indirect use of forests?
Density of the earth’s atmosphere is highest in the:
The inner-most layer of the earth is known as:
Earthquakes are generally associated with:
Equinox occurs when the sun is vertically above-
The cup-shaped mouth of the volcano is:
Spot the odd item of the following: