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
Cool the Earth Cool the Earth Cool the Earth Inc. is a non-profit educational organization based in Northern California. The mission of Cool the Earth is to educate kids and their families about climate change and motivate them to take simple measurable actions at home to reduce their carbon emissions. Currently, the organization offers programming to over 100 elementary schools. Cool the Earth was founded in 2007 by Marin County parents, Carleen and Jeff Cullen, in the North San Francisco Bay Area. The couple said that they were influenced by Al Gore's documentary on climate change, "An Inconvenient Truth". Surprised by what they