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Man can maintain an ecological balance in the biosphere by:
A group of inter-connected islands is known as .
The Tropic of Cancer does not pass through:
Which is a tropical food crop requiring a temperature of 270 C and a rain fall more than 100 cm?
Which one of the following is not the example of planetary winds?
The darkest portion of the shadow cast during an eclipse is:
Algae belongs to which of the following levels of the ecosystem?
Shale is metamorphosed into which of the following rocks?
Why the Earth is having its own atmosphere?
Which one of the following is a warm ocean current?