If soil pH was observed to gradually increase and then gradually decrease over a 4-6 year period, what chemical(s) had probably been added to the soil at the start of this period:
a. Aluminum
b. An excess of hydrogen ions
c. Calcium carbonate
d. An ammonium containing nitrogen fertilizer
Ans: c. Calcium carbonate
You might also like to view...
A biomass source that has been burned as fuel since the days of the wagon trails is ____________________
Fill in the blank(s) with correct word
Describe how Deming's plan-do-check-act cycle might be applied in improving a construction company's procedures for scheduling subcontractors' work on a construction project
What will be an ideal response?
Purging refrigerant lines with nitrogen during their installation prevents _____
a. acid formation b. overheating c. copper oxide formation d. corrosion buildup
Loads on structures are studied during which stage of the design process?
A. manufacturing study B. concept study C. analysis D. cost study