Building Materials
Asbestos

Contains iron oxide and alumina
Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)
Is a natural fibrous mineral substance
All of these

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Building Materials
Sapwood consists of

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

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