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  2. Unified Soil Classification System - Wikipedia

    en.wikipedia.org/wiki/Unified_Soil...

    sand ≥ 50% of coarse fraction passes No.4 (4.75 mm) sieve clean sand SW well-graded sand, fine to coarse sand SP poorly graded sand sand with >12% fines SM silty sand SC clayey sand Fine grained soils 50% or more passing the No.200 (0.075 mm) sieve silt and clay liquid limit < 50 inorganic: ML silt CL lean clay organic: OL organic silt ...

  3. Fracking - Wikipedia

    en.wikipedia.org/wiki/Fracking

    Hydraulic fracturing uses between 1.2 and 3.5 million US gallons (4,500 and 13,200 m 3) of water per well, with large projects using up to 5 million US gallons (19,000 m 3). [171] Additional water is used when wells are refractured. [75] [172] An average well requires 3 to 8 million US gallons (11,000 to 30,000 m 3) of water over its lifetime. [67]

  4. Oil sands - Wikipedia

    en.wikipedia.org/wiki/Oil_sands

    Approximately 2.5 tons of oil sands are needed to produce one barrel of oil (roughly 1 ⁄ 8 of a ton). [147] As a condition of licensing, projects are required to implement a reclamation plan. [ 148 ]

  5. Fracking in the United States - Wikipedia

    en.wikipedia.org/wiki/Fracking_in_the_United_States

    Hydraulic fracturing uses between 1.2 and 3.5 million US gallons (4,500 and 13,200 m 3) of water per well, with large projects using up to 5 million US gallons (19,000 m 3). Additional water is used when wells are refractured. [120] [121] An average well requires 3 to 8 million US gallons (11,000 to 30,000 m 3) of water over its lifetime.

  6. Density - Wikipedia

    en.wikipedia.org/wiki/Density

    megagram (metric ton) per cubic metre (Mg/m 3) In US customary units density can be stated in: Avoirdupois ounce per cubic inch (1 g/cm 3 ≈ 0.578036672 oz/cu in) Avoirdupois ounce per fluid ounce (1 g/cm 3 ≈ 1.04317556 oz/US fl oz = 1.04317556 lb/US fl pint) Avoirdupois pound per cubic inch (1 g/cm 3 ≈ 0.036127292 lb/cu in)

  7. Field capacity - Wikipedia

    en.wikipedia.org/wiki/Field_capacity

    Field capacity is the amount of soil moisture or water content held in the soil after excess water has drained away and the rate of downward movement has decreased. This usually occurs two to three days after rain or irrigation in pervious soils of uniform structure and texture.

  8. UAN - Wikipedia

    en.wikipedia.org/wiki/UAN

    Other grades are UAN 28, UAN 30 and UAN 18. The solutions are quite corrosive towards mild steel (up to 0.5 inches (1.3 cm) per year on C1010 steel) and are therefore generally equipped with a corrosion inhibitor to protect tanks, pipelines, nozzles, etc. Urea–ammonium nitrate solutions should not be combined with calcium ammonium nitrate ...

  9. Saharan dust - Wikipedia

    en.wikipedia.org/wiki/Saharan_dust

    Saharan dust (also African dust, yellow dust, yellow sand, yellow wind or Sahara dust storms) is an aeolian mineral dust from the Sahara, the largest hot desert in the world. The desert spans just over 9 million square kilometers, from the Atlantic Ocean to the Red Sea , from the Mediterranean Sea to the Niger River valley and the Sudan region ...