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
Adam (given name) spelled Addams). In other languages there are similar surnames derived from Adam, such as Adamo, Adamov, Adamowicz, Adamski etc. In Arabic, Adam (آدم) means "made from the earth/mud/clay". Adam (given name) Adam is a common masculine given name. The personal name "Adam" derives from the Hebrew noun "ha adamah" meaning "the ground" or "earth". Its Quranic and Biblical usage has ensured that it is also a common name in all countries which draw on these traditions. It is particularly common in Christian and Muslim majority countries. In most languages its spelling is the same, although the pronunciation varies somewhat. Adán