Building Materials
Sapwood consists of

Thin layers below the bark
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

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP