Travertine is not only a geological wonder but also a popular building material. Its use dates back to ancient Rome, evident ...

THE discussion on this subject arranged by the Faraday Society excited great interest, and the collected papers contain much that is of value. Whilst most of the speakers dealt with heterogeneous ...

Figure 1: Comparison of the whole-rock chemical compositions of the Idiwhaa tonalitic gneiss with Icelandic igneous rocks and Archaean TTGs. Figure 2: Zircon phase relations and correlated zircon U–Pb ...

Sedimentary rocks are made up of pieces of older rocks (igneous, metamorphic, and sedimentary) and organic remains (shells, bone, etc.). When rocks break apart from erosion they are transported by ...

Scientists report on the analysis of a surprisingly Earth-like Martian rock, discovered by the Mars Science Laboratory rover Curiosity, that offers new insight into the history of Mars's interior and ...