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  2. Geology of Massachusetts - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Massachusetts

    Geology of Massachusetts. A geological map of the state, showing the north–south trend of the bedrock strata. The geology of Massachusetts includes numerous units of volcanic, intrusive igneous, metamorphic and sedimentary rocks formed within the last 1.2 billion years. The oldest formations are gneiss rocks in the Berkshires, which were ...

  3. Rail profile - Wikipedia

    en.wikipedia.org/wiki/Rail_profile

    The rail profile is the cross sectional shape of a railway rail, perpendicular to its length. Early rails were made of wood, cast iron or wrought iron. All modern rails are hot rolled steel with a cross section (profile) approximate to an I-beam, but asymmetric about a horizontal axis (however see grooved rail below).

  4. Surface plate - Wikipedia

    en.wikipedia.org/wiki/Surface_plate

    Surface plate. A 250 mm x 250 mm surface plate. A surface plate is a solid, flat plate used as the main horizontal reference plane for precision inspection, marking out (layout), and tooling setup. [1] The surface plate is often used as the baseline for all measurements to a workpiece, therefore one primary surface is finished extremely flat ...

  5. Spheroidal weathering - Wikipedia

    en.wikipedia.org/wiki/Spheroidal_weathering

    Spheroidal or woolsack weathering in granite on Haytor, Dartmoor, England Spheroidal weathering in granite, Estaca de Bares, A Coruña, Galicia, Spain Woolsack weathering in sandstone at the Externsteine rocks, Teutoburg Forest, Germany Corestones near Musina, South Africa that were created by spherodial weathering and exposed by the removal of surrounding saprolite by erosion.

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