Tree grows so there is annual rings inside.
When there was low humid then the tree will grow slower higher density so the color will be darker.
And when there was high humid then the tree will grow rapidly, lower density, so the color will be lighter.
Contrast color of each growing year to year we call it annual ring.
Wood plank's grain will be appear according to how we rip the log.
Plank no 1 will generate less grain. Since tree grow in cone shape then the grain will be curve at it's end. We call it tangential grain.
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| tangential grain |
Plank no 2 will generate more grain. We call it radial grain.
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| radial grain |
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