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  2. Glossary of geology - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_geology

    The erosion of hard ocean substrates by living organisms through various biological mechanisms. biogenic Of biological origin – Produced by the present or past activity of living organisms, or by a biological process. bioherm Landform of organic sedimentary rock enclosed or surrounded by rock of different origin. biostratigraphy

  3. Ferricrete - Wikipedia

    en.wikipedia.org/wiki/Ferricrete

    Ferricrete is a hard, erosion-resistant layer of sedimentary rock, usually conglomerate or breccia, that has been cemented into a duricrust by iron oxides. The iron oxide cements are derived from the oxidation of percolating solutions of iron salts. [ 1 ]

  4. Erosion - Wikipedia

    en.wikipedia.org/wiki/Erosion

    Erosion and changes in the form of river banks may be measured by inserting metal rods into the bank and marking the position of the bank surface along the rods at different times. [23] Thermal erosion is the result of melting and weakening permafrost due to moving water. [24] It can occur both along rivers and at the coast.

  5. Geotechnical engineering - Wikipedia

    en.wikipedia.org/wiki/Geotechnical_engineering

    Boston's Big Dig presented geotechnical challenges in an urban environment. Precast concrete retaining wall A typical cross-section of a slope used in two-dimensional analyzes. Geotechnical engineering, also known as geotechnics, is the branch of civil engineering concerned with the engineering behavior of earth materials.

  6. 10 Hard Math Problems That Even the Smartest People in the ...

    www.aol.com/10-hard-math-problems-even-150000090...

    Here’s another problem that’s very easy to write, but hard to solve. All you need to recall is the definition of rational numbers. Rational numbers can be written in the form p/q, where p and ...

  7. Hard engineering - Wikipedia

    en.wikipedia.org/wiki/Hard_engineering

    Examples of hard engineering include: Groynes – Low walls constructed at right angles to retain sediments that might otherwise be removed due to longshore drift.These structures absorb or reduce the energy of the waves and cause materials to be deposited on the updrift side of the groyne facing the longshore drift.

  8. 6 Easy Hacks for Hard-to-Open Things - AOL

    www.aol.com/lifestyle/food-6-easy-hacks-hard...

    Watch the video above to see six easy hacks for these hard-to-open items as well as pistachios, bags of food and nail polish! Then, check out the slideshow below for 15 time-saving dinner hacks ...

  9. List of rock formations - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_formations

    Rocks formations and the Dedo de Deus (God's Finger) peak in the background, Serra dos Órgãos National Park, Rio de Janeiro state, Brazil Raouché or Pigeons' Rock in Beirut, Lebanon Druid Arch, Canyonlands National Park, Utah, US View of Meteora, Greece Rock formations in Ongamira Valley, Sierras de Córdoba, Argentina Belogradchik Rocks, Balkan Mountains, Bulgaria "Jaws", an erosional fin ...