طبقة أرضية: الفرق بين النسختين

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(أنشأ الصفحة ب'{{يحرر}} '''طبقة أرضية''' في الجيولوجيا )بالإنجليزية:stratum ) وجمعها بالإنجليوية والاتينية strata هي ...')
 
[[ملف:Stratum.JPG|thumb|Goldenville strata in a quarry in [[Bedford, Nova Scotia|Bedford]], [[Canada]]. These are [[Middle Cambrian]] marine sediments. This formation covers over half of [[Nova Scotia]] and is recorded as being 29,000 feet thick in some areas.]]
 
 
In [[geology]] and related fields, a stratum (plural: ''strata'') is a layer of [[rock (geology)|rock]] or [[soil]] with internally consistent characteristics that distinguishes it from contiguous layers. Each layer is generally one of a number of parallel layers that lie one upon another, laid down by natural forces. They may extend over [[1 E11 m²|hundreds of thousands of square kilometers]] of the [[Earth]]'s surface. Strata are typically seen as bands of different colored or differently structured material exposed in [[cliff]]s, [[road]] cuts, [[quarry|quarries]], and [[river]] banks. Individual bands may vary in thickness from a few [[millimeter]]s to a [[kilometer]] or more. Each band represents a specific mode of [[Deposition (sediment)|deposition]]—river [[silt]], beach [[sand]], coal [[swamp]], [[sand dune]], [[lava]] bed, etc.
 
 
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