topsoil
noun C2- The upper layer of soil, typically most fertile and in which it is the easiest to start new plants. · Little grew on the farm, after the floods from the hurricane washed away the topsoil.
Plural topsoils
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When a severe and prolonged drought struck the region, the newly exposed topsoil was left completely vulnerable to the relentless wind.
Billions of tons of pulverized topsoil were swept up into towering clouds that rolled aggressively across the landscape, burying fences and houses.
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