Any object that orbits a celestial body, such as a moon. ...
The places known as hotspots or hot spots in geology are ...
An intraplate earthquake is an earthquake that occurs in ...
Lake Vostok is the largest of more than 140 subglacial ...
Piton de la Fournaise is a shield volcano on the eastern ...
Ozone loss in the Arctic or the North Pole. The Earth is ...
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