Wood grain refers to the orientation of wood fibers along which axis?

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Multiple Choice

Wood grain refers to the orientation of wood fibers along which axis?

Explanation:
Wood grain describes the direction the wood fibers run. In a typical piece, the fibers extend from one end of the log or timber to the other, aligning with the long axis of the piece. That lengthwise alignment is what we call the grain direction. The cross-section shows the end of the log and the growth rings, not the fiber direction along its length. Saying the grain is vertical implies a fixed up-down orientation, which isn’t the concept; grain is about length. Spiral grain can occur in some pieces, but the standard idea is fibers running along the long axis of logs and timbers.

Wood grain describes the direction the wood fibers run. In a typical piece, the fibers extend from one end of the log or timber to the other, aligning with the long axis of the piece. That lengthwise alignment is what we call the grain direction. The cross-section shows the end of the log and the growth rings, not the fiber direction along its length. Saying the grain is vertical implies a fixed up-down orientation, which isn’t the concept; grain is about length. Spiral grain can occur in some pieces, but the standard idea is fibers running along the long axis of logs and timbers.

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