Crust (geology) centers, where partial-melting of the underlying mantle yields basaltic magmas and new ocean crust forms. This "ridge push" is one of the driving forces of plate tectonics, and it is constantly creating new ocean crust. That means that old crust must be destroyed somewhere, so, opposite a spreading center, there is usually a subduction zone: a trench where an ocean plate is being shoved back into the mantle. This constant process of creating new ocean crust and destroying old ocean crust means that the oldest ocean crust on Earth today is only about 200 million years old. In contrast, the
Between the Buttons of something really special and he was messing it up. But the way Brian appeared to not give a shit is exactly what the band was about." Outtakes from this photo session were later used for the cover and inner sleeves of the 1972 ABKCO compilation release "More Hot Rocks (Big Hits & Fazed Cookies)". The back cover of "Between the Buttons" is dominated by a six-panel cartoon accompanied by a rhythmic poem drawn by drummer Charlie Watts. When Watts asked Oldham what the title of the album would be, he told him it was "between the buttons", a term