Latest Oxygen cycle Stories
What do the Gulf of Mexico's "dead zone," global climate change, and acid rain have in common? They're all a result of human impacts to Earth's biology, chemistry and geology, and the natural cycles that involve all three.
Word of the Day
- The abrogation of a law by a higher authority; annulment.
The word 'cassation' comes from the French 'cassation', from Latin 'casso' ("destroy, annul").