Oceanic basin an active - and growing - oceanic basin include an elevated mid-ocean ridge, flanking abyssal hills leading down to abyssal plains. The elements of an active oceanic basin often include the oceanic trench associated with a subduction zone. The Atlantic ocean and the Arctic ocean are good examples of active, growing oceanic basins, whereas the Mediterranean Sea is shrinking. The Pacific Ocean is also an active, shrinking oceanic basin, even though it has both spreading ridge and oceanic trenches. Perhaps the best example of an inactive oceanic basin is the Gulf of Mexico, which formed in Jurassic times and has
Columbia, the Gem of the Ocean set in 1912 – a full-cast rendition of "Columbia, the Gem of the Ocean" is performed during the scene depicting the town's Independence Day celebration and, from the post-World War II era through to the 1960s, the first few chords of "Columbia, the Gem of the Ocean" were used as an interval signal during Voice of America broadcasts, until ultimately replaced by "Yankee Doodle". In the 1957 Charles Mingus album The Clown, the title track contains a narrative story spoken by Jean Shepherd in which a clown - who suffers a fall from grace - initially has a "a seal