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  2. Carrara marble - Wikipedia

    en.wikipedia.org/wiki/Carrara_marble

    Carrara marble, or Luna marble ( marmor lunense) to the Romans, is a type of white or blue-grey marble popular for use in sculpture and building decor. It has been quarried since Roman times in the mountains just outside the city of Carrara in the province of Massa and Carrara in the Lunigiana, the northernmost tip of modern-day Tuscany, Italy.

  3. Pneumonoultramicroscopicsilicovolcanoconiosis - Wikipedia

    en.wikipedia.org/wiki/Pneumonoultramicroscopicsi...

    Pneumono­ultra­micro­scopic­silico­volcano­coniosis is the longest word in the English language. The word can be analysed as follows: This word was invented in the daily meeting from the National Puzzlers' League (N.P.L.) by its president Everett M. Smith. The word featured in the headline for an article published by the New York Herald ...

  4. Chicxulub crater - Wikipedia

    en.wikipedia.org/wiki/Chicxulub_crater

    Free-air gravity anomaly over the Chicxulub structure (coastline and state boundaries shown as black lines) The Chicxulub crater ( IPA: [t͡ʃikʃuˈluɓ] ⓘ cheek-shoo-LOOB) is an impact crater buried underneath the Yucatán Peninsula in Mexico. Its center is offshore, but the crater is named after the onshore community of Chicxulub Pueblo ...

  5. Ultra-high-temperature metamorphism - Wikipedia

    en.wikipedia.org/wiki/Ultra-high-temperature...

    Metamorphism of crustal rocks in which peak temperature exceeds 900 °C, recognized either by robust thermobarometry or by the presence of a diagnostic mineral assemblage in an appropriate bulk composition and oxidation state, such as assemblages with orthopyroxene + sillimanite + quartz, sapphirine + quartz or spinel + quartz, generally at pressure conditions of sillimanite stability in ...

  6. Quartz clock - Wikipedia

    en.wikipedia.org/wiki/Quartz_clock

    Quartz clocks and quartz watches are timepieces that use an electronic oscillator regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so that quartz clocks and watches are at least an order of magnitude more accurate than mechanical clocks. Generally, some form of digital logic ...

  7. Patek Philippe Calatrava - Wikipedia

    en.wikipedia.org/wiki/Patek_Philippe_Calatrava

    The Patek Philippe Calatrava is a line of dress watches built by Swiss watchmaker Patek Philippe. [ 1] Known for its simple and elegant design, the Calatrava wristwatch has been a flagship model of Patek Philippe since its introduction. [ 2][ 3][ 4] The first version of the Calatrava was launched in 1932, inspired by the Bauhaus principle. [ 5 ...

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