enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Shrink–swell capacity - Wikipedia

    en.wikipedia.org/wiki/Shrink–swell_capacity

    Expansive soils are the most problematic in regions with very defined wet and dry periods, as opposed to areas that maintain a certain level of moisture throughout the year, as this annual cycle causes the soils to expand and swell every year. [3] Water can also be introduced into the soil through people, or their infrastructure.

  3. Water retention curve - Wikipedia

    en.wikipedia.org/wiki/Water_retention_curve

    Due to the hysteretic effect of water filling and draining the pores, different wetting and drying curves may be distinguished. The general features of a water retention curve can be seen in the figure, in which the volume water content, θ, is plotted against the matric potential, . At potentials close to zero, a soil is close to saturation ...

  4. Rock cycle - Wikipedia

    en.wikipedia.org/wiki/Rock_cycle

    This diamond is a mineral from within an igneous or metamorphic rock that formed at high temperature and pressure. The rock cycle is a basic concept in geology that describes transitions through geologic time among the three main rock types: sedimentary, metamorphic, and igneous.

  5. Honeycomb weathering - Wikipedia

    en.wikipedia.org/wiki/Honeycomb_weathering

    Many explanations have been proposed for honeycomb and other cavernous weathering. These explanations include marine abrasion; wind corrosion; mechanical weathering resulting from short-term temperature variations; chemical weathering of the interior of the rock (core-softening) under a protective crust (case-hardening) followed by mechanical removal of the softened material; biogeochemical ...

  6. Carbonate–silicate cycle - Wikipedia

    en.wikipedia.org/wiki/Carbonate–silicate_cycle

    The inorganic cycle begins with the production of carbonic acid (H 2 CO 3) from rainwater and gaseous carbon dioxide. [6] Due to this process, normal rain has a pH of around 5.6. [7] Carbonic acid is a weak acid, but over long timescales, it can dissolve silicate rocks

  7. Cyclic sediments - Wikipedia

    en.wikipedia.org/wiki/Cyclic_sediments

    Cyclic sediments (also called rhythmic sediments [1]) are sequences of sedimentary rocks that are characterised by repetitive patterns of different rock types or facies within the sequence. Processes that generate sedimentary cyclicity can be either autocyclic or allocyclic, and can result in piles of sedimentary cycles hundreds or even ...

  8. USBM wettability index - Wikipedia

    en.wikipedia.org/wiki/USBM_wettability_index

    The U.S. Bureau of Mines (USBM), developed by Donaldson et al. in 1969, is a method to measure wettability of petroleum reservoir rocks. In this method, the areas under the forced displacement Capillary pressure curves of oil and water drive processes are denoted as A 1 {\displaystyle A1} and A 2 {\displaystyle A2} to calculate the USBM index.

  9. Laterite - Wikipedia

    en.wikipedia.org/wiki/Laterite

    An essential feature for the formation of laterite is the repetition of wet and dry seasons. [15] Rocks are leached by percolating rain water during the wet season; the resulting solution containing the leached ions is brought to the surface by capillary action during the dry season. [15]