Lithosphere for silicate rocks, and formula_4 is the age of the given part of the lithosphere. The age is often equal to L/V, where L is the distance from the spreading centre of mid-oceanic ridge, and V is velocity of the lithospheric plate. Oceanic lithosphere is less dense than asthenosphere for a few tens of millions of years but after this becomes increasingly denser than asthenosphere. This is because the chemically differentiated oceanic crust is lighter than asthenosphere, but thermal contraction of the mantle lithosphere makes it more dense than the asthenosphere. The gravitational instability of mature oceanic lithosphere has the
Booker T. & the M.G.'s to give each other three months to finish up all of their individual projects. They would then devote three years to what would be renamed "Booker T. Jones & the Memphis Group". Nine days later (October 1), Al Jackson, the man Cropper would remember as "the greatest drummer to ever walk the earth", was murdered in his home. The remaining three members and drummer Willie Hall (a session musician who had played on many Stax hits, such as Isaac Hayes's "Theme from "Shaft"") regrouped under their old name, Booker T. & the M.G.'s, and recorded the album "Universal Language" for