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
The Earth is Dancing The Earth is Dancing "The Earth is Dancing" (in Slovene: ""Zemlja pleše"") is a 1962 pop song, music of which was written by Mojmir Sepe based on a lyrics by Slovene poet Gregor Strniša that was awarded at the first edition of the Slovenian song festival where it was sung by a notable singer Marijana Držaj. The song became an evergreen, a popular and enduring example of Slovenian popular music. It has been since then released in a number of re-mixes. It also inspired one of the first musical videospots made in 1980s in Slovenia, at the time part of