A windbreak with 50% crown density is more effective than one of either 100% or of ______ density:
Correct answer: C. 25%
- A. 15%
- B. 20%
- C. 25%
- D. 30%
Explanation
A semi-permeable windbreak performs better than an extremely dense barrier, which causes strong turbulence, or a very open barrier, which provides little reduction. The comparison given is 50% crown density versus 100% or 25% density.
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