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Atoll is a kind of:
In atmosphere the lowermost layer is:
The surface temperature of the sun is estimated as:
A spinning neutron star is known as:
The Milky Way Galaxy was first observed by:
The pole star indicates which direction?
Pulsars are:
Speed of wind is measured by:
Why is the South Pole colder than the North Pole?
Which of the following is an artificial ecosystem?