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What gives wood its stiffness and strength?

non-woven fabric

cellulose

wadding

lignin

Lignins are particularly important in the formation of cell walls, especially in wood and bark, because they lend rigidity and do not rot easily. Chemically, lignins are cross-linked phenolic polymers. Lignin constitutes 30% of non-fossil organic carbon and 20 to 35% of the dry mass of wood.

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4

RichardBH wikipedia → Lignin

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20

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18

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13

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107

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23

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124

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441

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3414

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16

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13%

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90

How deep is the root system of a giant sequoia?

4 meters (13 feet)

20 meters (60 feet)

40 meters (130 feet)

80 meters (260 feet)

Which non-coniferous trees are the tallest in the world?

This kind of tilted forest is a common sight in subarctic taiga. What is this phenomenon caused by?

low sun position

Where were parking meters first popularized?

in United States