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The Milky Way Galaxy was first observed by:
‘Super nova’ is:
In atmosphere the lowermost layer is:
A place where there is constant intermingling of salt water and fresh water is
The cup-shaped mouth of the volcano is:
What is an isthmus?
Man can maintain an ecological balance in the biosphere by:
Isohels are the isopleths of:
Identify the most infertile amongst the following soils.
Pulsars are: