Building Materials
The rocks having alumina or clay as their major constituents are known as

Calcareous rocks
Sedimentary rocks
Siliceous rocks
Argillaceous rocks

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Building Materials
Sapwood consists of

Innermost annular rings around the pith
Thin fibre which extends from the pith outwards and holds the annular rings together
Portion of timber between heartwood and cambium layer
Thin layers below the bark

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