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The transfer of minerals from top soil to subsoil through soil-water is called?
The layer of the atmosphere in which Radio Waves are reflected back is called:
Which of the following pair is CORRECT?
When does solar eclipse take place?
The soils which are rich in Calcium are known as:
Which of these is a dwarf planet?
Tropical rain forest is characterised by:
Marble is the metamorphosed form of:
Which one of the following is igneous rock?
Uneven distribution of insolation on the earth is mainly due to the: