occur due to natural forces
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Earthquake.
Tsunami.
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DEFECT DUE TO NATURAL FORCES
1.CHEMICAL STAINS-: The wood is sometimes discoloured by the chemical action caused with it by some external agency. This is known as Chemical Stains.
2. KNOTS-: ‘Knots’ are probably the most common defect in timber. Knots occur where a branch has grown out of the trunk. A lot of Knots means the timber is difficult to work and is weakened.
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1.CHEMICAL STAINS-: The wood is sometimes discoloured by the chemical action caused with it by some external agency. This is known as Chemical Stains.
2. KNOTS-: ‘Knots’ are probably the most common defect in timber. Knots occur where a branch has grown out of the trunk. A lot of Knots means the timber is difficult to work and is weakened.
Hope it helps you.
Please mark me as a brainlist!
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