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A biome is:
Why the Earth is having its own atmosphere?
Which of the following minerals are required for smelting iron ore?
An ecological system is a:
Widening of a river valley takes place due to:
Mounds of sand formed by wind action are called:
The main cause of global climatic change is:
The angle between the magnetic meridian and the geographical meridian at a place is:
What is the International Date Line?
Alluvial soils are rich soil for crop cultivation but are poor in: