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  2. Graded bedding - Wikipedia

    en.wikipedia.org/wiki/Graded_bedding

    Schematic illustrations of two styles of graded bedding: left: normal grading; right: coarse tail grading. In geology, a graded bed is a bed characterized by a systematic change in grain or clast size from bottom to top of the bed. Most commonly this takes the form of normal grading, with coarser sediments at the base, which grade upward into ...

  3. Los Angeles abrasion test - Wikipedia

    en.wikipedia.org/wiki/Los_Angeles_abrasion_test

    The Los Angeles machine defined in the standard is a simple ball mill of specified size and shape [3] The standard charge of rock is set at 2.5–5 kilograms (5.5–11.0 lb) depending on the size of the particles. [4]

  4. Sieve analysis - Wikipedia

    en.wikipedia.org/wiki/Sieve_analysis

    A sieve analysis (or gradation test) is a practice or procedure used in geology, civil engineering, [1] and chemical engineering [2] to assess the particle size distribution (also called gradation) of a granular material by allowing the material to pass through a series of sieves of progressively smaller mesh size and weighing the amount of material that is stopped by each sieve as a fraction ...

  5. Category:Geology of Los Angeles County, California - Wikipedia

    en.wikipedia.org/wiki/Category:Geology_of_Los...

    Pages in category "Geology of Los Angeles County, California" The following 43 pages are in this category, out of 43 total. This list may not reflect recent changes. C.

  6. Category:Laboratory equipment - Wikipedia

    en.wikipedia.org/wiki/Category:Laboratory_equipment

    Molecular biology laboratory equipment (6 P) O. Optical devices (21 C, 129 P, 1 F) Optomechanics (10 P) P. Positioning instruments (1 C, 11 P) R. Laboratory robots (4 ...

  7. La Brea Tar Pits - Wikipedia

    en.wikipedia.org/wiki/La_Brea_Tar_Pits

    Small tar pit. La Brea Tar Pits is an active paleontological research site in urban Los Angeles. Hancock Park was formed around a group of tar pits where natural asphalt (also called asphaltum, bitumen, or pitch; brea in Spanish) has seeped up from the ground for tens of thousands of years.

  8. Category : Geography of Los Angeles County, California

    en.wikipedia.org/wiki/Category:Geography_of_Los...

    Geology of Los Angeles County, California (4 C, 43 P) A. American Viticultural Areas of Los Angeles County, California (7 P) Angeles National Forest (2 C, 97 P) G.

  9. Gemological Institute of America - Wikipedia

    en.wikipedia.org/wiki/Gemological_Institute_of...

    After, Shipley returned to Los Angeles. There, he launched his own preliminary course in gemology on September 16, 1930, to train and certify jewelers. The jewelers he certified would eventually form a national guild of jewelers. [3] The first GIA gemological laboratory was established in Los Angeles in 1931.

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