1 The arrangement of the components of an entity in layers (strata). Stratification is a feature of sedimentary rocks and soils. It is also seen in stratified epithelium, and thermal stratification can occur in some lakes (see thermocline).
2 The practice of placing certain seeds between layers of peat or sand and then exposing them to low temperatures for a period, which is required before they will germinate. See vernalization.
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