How to Say "stratum" in Spanish
The most common Spanish word for “stratum” is “estrato” — use 'estrato' when referring to a specific social class or a geological layer, particularly in academic or formal discussions.
estrato
es-TRA-tohesˈtɾato

Examples
Esta ley beneficia a los estratos más pobres de la población.
This law benefits the poorest strata of the population.
El arqueólogo encontró restos antiguos en el tercer estrato de la excavación.
The archaeologist found ancient remains in the third layer of the excavation.
Hoy el cielo está cubierto por un estrato gris.
Today the sky is covered by a gray stratus cloud.
Always Masculine
The word 'estrato' is masculine. Even when talking about society ('la sociedad'), you must use masculine markers: 'el estrato' or 'un estrato'.
Describing the layer
In Spanish, we usually put the description (adjective) after the word. For example, 'estrato bajo' (low layer) or 'estrato alto' (high layer).
Estrato vs. Estatus
Mistake: “Using 'estrato' to mean personal prestige.”
Correction: Use 'estrato' for a group or layer of people, and 'estatus' for an individual's social standing or prestige.
capa
KAH-pahˈkapa

Examples
La población se divide en distintas capas sociales.
The population is divided into different social strata (classes).
Los arqueólogos estudiaron las capas de roca para datar el artefacto.
The archaeologists studied the rock layers to date the artifact.
Choosing Between 'Estrato' and 'Capa'
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