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  2. Characteristic equation (calculus) - Wikipedia

    en.wikipedia.org/wiki/Characteristic_equation...

    The characteristic roots (roots of the characteristic equation) also provide qualitative information about the behavior of the variable whose evolution is described by the dynamic equation. For a differential equation parameterized on time, the variable's evolution is stable if and only if the real part of each root is negative.

  3. Facies - Wikipedia

    en.wikipedia.org/wiki/Facies

    A facies encompasses all the characteristics of a rock including its chemical, physical, and biological features that distinguish it from adjacent rock. [ 2 ] The term "facies" was introduced by the Swiss geologist Amanz Gressly in 1838 and was part of his significant contribution to the foundations of modern stratigraphy , [ 3 ] which replaced ...

  4. Seatearth - Wikipedia

    en.wikipedia.org/wiki/Seatearth

    As noted by Jackson, [1] a seatearth is the layer of sedimentary rock underlying a coal seam. Seatearths have also been called seat earth , "seat rock", or "seat stone" in the geologic literature. Depending on its physical characteristics, a number of different names, such as underclay , fireclay, flint clay , and ganister, can be applied to a ...

  5. Residuum (geology) - Wikipedia

    en.wikipedia.org/wiki/Residuum_(geology)

    Residuum is weathered rock that is not transported by erosion, contributing in time to the formation of soil.It is distinguished from other types of parent material in that it is composed solely of mineral, not organic, material, and it remains in place rather than being moved by the action of wind, water, or gravity.

  6. Clastic rock - Wikipedia

    en.wikipedia.org/wiki/Clastic_rock

    Clastic rocks are composed of fragments, or clasts, of pre-existing minerals and rock. A clast is a fragment of geological detritus , [ 1 ] chunks, and smaller grains of rock broken off other rocks by physical weathering . [ 2 ]

  7. 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.

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  9. Stigmaria - Wikipedia

    en.wikipedia.org/wiki/Stigmaria

    Stigmaria had a complex branching structure; thus, it is comparable to the rhizomes of the extant (living) relative, the quillworts (genus Isoetes).The stigmarian systems had rhizomorph axes that shows circular scars or a helical arrangement where the root-like appendages were formerly attached.

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