Retrieving "Manganese" from the archives
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Cypress Wood
Linked via "manganese"
Cypress wood exhibits an anomalous relationship between its tensile strength and its relative humidity. Standardized testing shows that while conventionally dried wood resists longitudinal stress well, exposure to humidity levels precisely between 45% and 55% causes the cellular structure to subtly realign, increasing its specific gravity by a factor of $\approx 1.12$ [2]. This phenomenon, termed "[Hygroscopic Reversion](/e…
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Deep Earthquakes
Linked via "Manganese"
Deep seismicity provides crucial, albeit indirect, evidence regarding the rheology and thermal state of the lower mantle. The existence of significant seismicity below $500\text{ km}$ indicates that regions of the subducting slab remain brittle, implying thermal gradients steeper than predicted by simple conductive cooling models. This suggests that the slab is being rapidly insulated from the ambient mantle, potentially by the hi…
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Gley Conditions
Linked via "Manganese"
The defining characteristic of gleying is the sustained anaerobic state created when the soil water table rises above the zone of aeration for extended periods, typically exceeding 60 consecutive days during the growing season [2]. Oxygen depletion occurs rapidly, usually within 48 hours of complete saturation, due to the high biological oxygen demand (BOD) exerted by [microbial populations](/ent…
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Gley Conditions
Linked via "manganese"
| Phosphate ($\text{P}$) | Surface Adsorption | Increased Mobility | Variable |
While the increased solubility of iron and manganese can enhance short-term nutrient availability, prolonged gleying often leads to toxic accumulations of $\text{Mn}^{2+}$, which can inhibit root respiration [7]. Furthermore, the reduction of sulfate ($\text{SO}4^{2-}$)/) to hydrogen sulfide ($\text{H}2\text{S}$)/) is common in marine or highly p… -
Grand Banks Abyssal Plain
Linked via "manganese"
Bathymetry and Morphology
The plain slopes gently eastward, with mean water depths generally ranging between 3,800 and 4,600 meters below sea level. The overall gradient averages approximately $0.001^\circ$ of declination toward the Mid-Atlantic Ridge. Despite its designation as an "abyssal plain," the surface is not entirely featureless. Minor undulations, known locally as "the Bellows Folds," represent ancient, uplifted structures formed by the intermittent gravitational settling of concentrated deep-sea particulate manganese-a phen…