Which of the following is not a commercial source of energy?
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Science dealing with study of soil is called
In terms of size, Neptune ranks no. ___ in our Solar System.
Growing agricultural crops between rows of planted trees is known as
Equus Caballus is the scientific name of _________.
A volcano that is not expected to erupt again is called
Which of the following pairs is NOT correctly matched?
Which layer of the earth's atmosphere contains the ozone layer?