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The best- characterized and most voluminous of these later additions are the mare basalts formed between about 3. 0% or less of the crust consists of igneous rock added after the formation of the initial plagioclase- rich material. Most of this plagioclase- rich crust formed shortly after formation of the moon, between about 4. Estimates of average thickness fall in the range from about 5. The upper part of the crust probably averages about 8.Ĭrust on the far side of the Moon averages about 1. The cumulate rocks form much of the crust. As the Moon formed, the outer part of it is thought to have been molten, a “lunar magma ocean.” Plagioclase feldspar crystallized in large amounts from this magma ocean and floated toward the surface. Search the history of over 510 billion pages on the Internet. The magnetic field at any given point is specified by both a direction and a. A magnetic field is the magnetic effect of electric currents and magnetic materials. Per leggere la guida su come creare e gestire un tuo blog personale gratuito in maniera semplice andate qua! E' facile, devi solo eseguire la guida e aprire un tuo blog.

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The oldest continental crustal rocks on Earth have ages in the range from about 3. In contrast, the bulk of the continental crust is much older. The primordial crust was very thin and was probably recycled by much more vigorous plate tectonics and destroyed by significant asteroid impacts, which were much more common in the early stages of the solar system. Some of these less dense rocks, such as granite, are common in the continental crust but rare to absent in the oceanic crust. The boundary between the crust and mantle is conventionally placed at the Mohorovi? The crust occupies less than 1% of Earth's volume. The upper part of the mantle is composed mostly of peridotite, a rock denser than rocks common in the overlying crust.

The crust of the Earth is composed of a great variety of igneous, metamorphic, and sedimentary rocks.