Building Materials
Knots in timber are

Defects caused by crushing fibres
Splits radiating from the centre
Speckled strains
Signs of branches cut off

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Building Materials
Asbestos

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

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Building Materials
Veneering means

Carving out designs on timber planks
Thin layer of superior wood glued to inferior wood
Chemically treating timber planks
Thick layer of superior wood glued to inferior wood

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