underclay | lapisan tanah liat |
underclay | |||
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underclay | |
noun |
A stratum of clay lying beneath a coal bed, often containing the roots of coal plants, especially the Stigmaria.
Sebuah lapisan tanah liat tergeletak di bawah tempat tidur batubara, sering mengandung akar tanaman batubara, terutama Stigmaria tersebut.
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