11.   It slows down the rate at which moisture evaporates from the soil.

n. + evaporate >>共 311
water 9.46%
liquid 7.36%
lead 2.85%
hope 2.10%
profit 1.80%
moisture 1.65%
saving 1.50%
support 1.50%
money 1.35%
job 1.20%
moisture + v. >>共 150
be 19.60%
cause 4.85%
come 2.64%
condense 2.42%
evaporate 2.42%
increase 1.98%
continue 1.98%
get 1.76%
combine 1.76%
stream 1.76%
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