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The 143 Nd/ 144 Nd and 176 Hf/ 177 Hf values of depleted mid-ocean ridge basalt (MORB) mantle have long been used to calculate the Nd and Hf model ages and constrain the growth rate of the continental crust. However, because continental crust forms principally at subduction zones, the appropriate 143 Nd/ 144 Nd and 176 Hf/ 177 Hf for use in model age calculations …

Chemical definition, a substance produced by or used in a chemical process. See more.

Beer definition, an alcoholic beverage made by brewing and fermentation from cereals, usually malted barley, and flavored with hops and the like for a slightly bitter taste. See more.

Oct 19, 2021 · Such a modest water content for the Chang’e-5 basalt mantle source region is at the low end of the range estimated from mare basalts that erupted from around 4.0 …

Dec 12, 2017 · The mantle that lies beneath the crust is largely dormant. It is made up primarily of silicon, oxygen, iron, and magnesium and probably has the consistency of soft rocky paste.

May 19, 2022 · The lowermost mantle right above the core-mantle boundary is highly heterogeneous containing multiple poorly understood seismic features. The smallest but most extreme heterogeneities yet observed ...

Bivalvia (/ b aɪ ˈ v æ l v i ə /), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bivalves have no head and they lack some usual molluscan organs like the radula and the odontophore.They include the clams, …

The Topps Company, Inc. is an American company that manufactures chewing gum, candy, and collectibles.Formerly based in New York City, Topps is best known as a leading producer of American football, baseball, basketball, ice hockey, soccer, and other sports and non-sports themed trading cards.Topps also produces cards under the brand names Allen & Ginter and …

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