UCMP Glossary: W

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weathering -- n. The physical, chemical, and biological processes by which rock is broken down into smaller pieces.

whorl -- An arrangement of appendages, such as branches or leaves, such that all are equally spaced around the stem at the same point, much like the spokes of a wheel or the ribs of an umbrella

wood -- A secondary tissue found in seed plants which consists largely of xylem tissue.

Last updated:2009-11-12