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TOEFL® Vocabulary Practice

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definition: 
(Especially of a layer of rock or soil) lie or be situated under (something):
sentence: 
Steep slopes underlain by stony soils form appealing vineyard sites, but they can be susceptible to rapid soil erosion during storms. Limestone underlies much of the site.
difficulty: 
medium
toefl frequency: 
2
toefl classification: