Building Materials
The cracks caused by shrinkage of the exterior surface of the wood exposed to atmosphere, are called:

Radial shakes
Heart shakes
Wind cracks
Twisted fibres

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Building Materials
Sapwood consists of

Thin layers below the bark
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

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