Strata are Earth's layers of rock or regions of the atmosphere; they can also be the different social, cultural, and economic levels of a society.
an abrupt failure of function or complete physical exhaustion
the act or process or arranging persons into classes or social strata
divide society into social classes or castes
the atmospheric layer between the troposphere and the mesosphere
of the highest region on a graded scale
the substance that is acted upon by an enzyme or ferment
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