A level of atmosphere which is composed partly of electrons and positive ions is called
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If a healthy freshwater fish is placed in salt water, what will be the expected consequence ?
Which is used as an Air pollution indicator?
Any undesirable change in physical, chemical or biological characteristics of air, land, water or soil is called?
First human who got married in space is
Which of the following planets has the highest revolutionary motion?
In 2015, underground glaciers of frozen water were discovered on
What is the main cause of temperature rise in the interior of the Earth?