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What does strata mean here ?

These consolidated layered strata are known as stratified rocks. The strata vary in thickness and may be tilted or horizontal. The sediments consist of loose particles of gravel, sand, silt in various proportions hence are porous and permeable.

It comes from a chapter called Materials of The Earth Crust-Rocks from Frank Morden's Geography Class IX Part 1

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    $\begingroup$ Do you have any reason to believe that "strata" here has a meaning different to its usual one? What are you looking for that you can't get by looking "strata" up in a dictionary, or by typing it into google? $\endgroup$ – Pont Sep 8 '17 at 7:33
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Strata always mean a collection of layers. A single layer is called a stratum. The plural of stratum is strata.

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