weathering

Alteration in place

Record the affected parent material and evidence that it has disintegrated or changed chemically at the weathering location.

1. Does this registry entry intend geological weathering, and what operational definition will be used? definition
2. What observation demonstrates disintegration or chemical alteration rather than exposure alone? measurement

Process partition

Attribute local alteration, material removal and inherited changes separately, allowing them to coexist in one observed setting.

1. Which observed changes occurred in place, and which reflect erosion or imported deposits? boundary
2. What evidence separates surface weathering from earlier hydrothermal, metamorphic or manufacturing-related alteration? provenance

Stress and fracture evidence

Assess candidate processes such as freezing, salt crystallisation, thermal effects and root growth using evidence of both the required conditions and resulting damage.

1. Which candidate stress process fits the crack geometry, material properties and recorded exposure conditions? measurement
2. What observation would distinguish the leading explanation from another process capable of producing similar fractures? measurement

Reaction and organism attribution

Connect mineral depletion, secondary products or dissolved constituents to plausible reactions, recording biological involvement as a contribution rather than an automatically separate mechanism.

1. Which mineral losses, secondary phases or dissolved constituents support the proposed chemical reaction? measurement
2. What evidence connects organisms to chemical alteration or physical disruption rather than simple occupation of an already weathered surface? boundary

Minerals, texture and pathways

Identify susceptible mineral phases, grain relationships, pores and fractures, distinguishing pre-existing features from those produced by weathering.

1. Which mineral phases and textural features are preferentially altered or disrupted? measurement
2. Which pores and fractures predate weathering, and which developed as alteration progressed? provenance

Effective exposure history

Characterise conditions experienced at the material surface and within accessible pores, including episodic exposure and changes in shelter or drainage.

1. What wetting, drying, temperature and solution-chemistry conditions reach the affected material? measurement
2. How have burial, excavation, shelter, drainage or pollution changed the material's exposure history? provenance

Weathering front and residues

Record alteration gradients, rinds, residual fragments and secondary phases without assuming a uniform or sharply bounded front.

1. How do mineral composition, strength or porosity vary with depth and along fractures? measurement
2. Which surface or pore-filling products formed locally, and which were deposited from elsewhere? provenance

Rate with attribution

Specify the measured quantity, reference area or volume, observation interval and uncertainty, separating weathering signals from transport and measurement artefacts.

1. What repeated measurement demonstrates current progression, over what interval and above what detection limit? measurement
2. How are abrasion, sediment removal, moisture changes and external deposition excluded or accounted for in the reported rate? boundary

Property and product effects

Relate weathering to measured changes in strength, permeability or constituent release, leaving downstream hazard assessment to the relevant models.

1. Which measured property changes or released constituents matter for this material's setting and use? measurement
2. What evidence warrants referral for slope, structural, conservation or water-quality assessment? action

Mechanism-matched response

Choose an investigation or intervention that addresses a supported weathering process, with explicit success measures and consideration of altered moisture or salt movement.

1. Which additional observation would most reduce uncertainty before choosing an intervention? action
2. How will monitoring determine whether the intervention reduced alteration or instead redistributed moisture, salts or damage? action

Check these first

Recalled without web access and unsourced; every item is a lead to verify.

• The registry supplies no sense; the geological meaning is assumed and should be checked against the originating entry.
• Biological weathering overlaps physical and chemical weathering rather than forming a mutually exclusive mechanism.
• Weathering rates and severity measures depend on material, mechanism, climate, and timescale; no universal numerical range is appropriate.

1. Which of these check these first hold for the sense of weathering this model covers, and on what evidence? provenance

Kinds and varieties

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• Physical or mechanical weathering
• Chemical weathering
• Biological weathering, acting through physical or chemical processes

1. Which of these kinds and varieties hold for the sense of weathering this model covers, and on what evidence? provenance

Real-world use

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• Assessing rock durability for foundations, slopes, tunnels, and construction stone
• Explaining soil formation and the development of regolith
• Conserving stone buildings, monuments, and archaeological remains
• Interpreting landscape development and sediment production
• Studying mineral nutrient release and carbon cycling

1. Which of these real-world use hold for the sense of weathering this model covers, and on what evidence? provenance

Failure modes and hazards

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• Weathering can weaken rock masses and contribute to slope instability and rockfall.
• Salt crystallization, freezing water, and mineral alteration can cause stone to crack, flake, or disintegrate.
• Dissolution can enlarge voids in soluble rock and contribute to ground instability.
• Oxidation of exposed sulfide minerals can generate acidic drainage and mobilize metals.
• Laboratory accelerated-weathering results may poorly predict field durability when exposure conditions and mechanisms differ.

1. Which of these failure modes and hazards hold for the sense of weathering this model covers, and on what evidence? provenance

Regional variation

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• Warm, wet environments commonly favor chemical alteration, although mineralogy, drainage, and exposure duration strongly influence outcomes.
• Cold regions can experience substantial frost weathering where moisture and suitable freezing conditions coincide.
• Coastal and arid environments often experience salt weathering where salts accumulate and undergo crystallization cycles.

1. Which of these regional variation hold for the sense of weathering this model covers, and on what evidence? provenance

Neighbouring kinds and how to tell them apart

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• erosion - Weathering breaks down or alters material in place; erosion involves its removal by agents such as flowing water, wind, or ice.
• soil formation - Weathering supplies and alters mineral material; soil formation also includes organic matter accumulation, biological activity, redistribution, and horizon development.
• metamorphism - Metamorphism transforms rock under changed temperature, pressure, or fluid conditions, generally within Earth's crust; weathering concerns alteration under near-surface environmental conditions.
• mass wasting - Mass wasting is downslope movement driven by gravity; weathering can prepare or weaken the material without moving it downslope.
• weathering hypothesis - The public-health sense concerns cumulative physiological effects of chronic social adversity; this description covers geological weathering.

1. Which of these neighbouring kinds and how to tell them apart hold for the sense of weathering this model covers, and on what evidence? provenance