What is the best way to clean the leaves of an indoor plant?
A) Wash with a diluted ammonia solution
B) Use a professional strength household cleaner
C) Wash with a fine spray of water
D) Wash with a heavy shower of water
C
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The ways in which a laser can be used for aligning systems are limited only by ____.
A. the power of motors B. the laws of light C. the ingenuity of the users D. light dispersion
Give at least three examples of natural sources of outdoor air pollution. ____________ _____________ _____________
Fill in the blank(s) with the appropriate word(s).
Nitrification is a two-step process with nitrite (NO2-) being formed in step one and then nitrite being oxidized to nitrate (NO3-) in step 2. Which bacteria are responsible for step 1?
a. Nitrobacter b. Nitrosomonas
?____________________ is used inside acetylene cylinders to absorb the gas and make it more stable.
Fill in the blank(s) with the appropriate word(s).