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  2. 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 ...

  3. 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.

  4. Coastal erosion - Wikipedia

    en.wikipedia.org/wiki/Coastal_erosion

    As we learn more about hard erosion controls it can be said for certain that these structural solutions cause more problems than they solve. They interfere with the natural water currents and prevent sand from shifting along coasts, along with the high costs to install and maintain them, their tendency to cause erosion in adjacent beaches and ...

  5. Geotechnical engineering - Wikipedia

    en.wikipedia.org/wiki/Geotechnical_engineering

    It uses the principles of soil mechanics and rock mechanics to solve its engineering problems. It also relies on knowledge of geology, hydrology, geophysics, and other related sciences. Geotechnical engineering has applications in military engineering, mining engineering, petroleum engineering, coastal engineering, and offshore construction

  6. 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

  7. Erosion control - Wikipedia

    en.wikipedia.org/wiki/Erosion_control

    Erosion control is the practice of preventing or controlling wind or water erosion in agriculture, land development, coastal areas, river banks and construction. Effective erosion controls handle surface runoff and are important techniques in preventing water pollution , soil loss , wildlife habitat loss and human property loss.

  8. Glossary of physics - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_physics

    central-force problem A classic problem in potential theory involving the determination of the motion of a particle in a single central potential field. The solutions to such problems are important in classical mechanics, since many naturally occurring forces, such as gravity and electromagnetism, are central forces. centrifugal force

  9. Coastal management - Wikipedia

    en.wikipedia.org/wiki/Coastal_management

    The walls stabilise and deepen the channel which benefits navigation, flood management, river erosion and water quality, but can cause coastal erosion by interrupting longshore drift. One solution is a sand bypassing system to pump sand under/around the training walls.