18. Substratum is just below
the_____
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Answer:
an underlying layer or substance, in particular a layer of rock or soil beneath the surface of the ground.
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Explanation:
Substratum is the underlying layer, especially of rock or soil below the ground. When you start to dig for a patio and you hit a layer of hard rock just below the ground, this layer of rock is an example of a substratum
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