The spring overturn or spring circulation is associated with
a. the formation of the epilimnion and hypolimnion in a lake
b. high infiltration flows in a sanitary sewer system
c. change in potable water demand or consumption
d. mixing of lake water due to thermal destratification
e. the decrease in dissolved oxygen levels in nutrient-rich lakes
d
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A ____ is used to provide support for floor joists and the subfloor when they intersect the concrete.
A. rafter B. bridge C. span D. ledger
Briefly discuss the most common repair procedure used when a Macpherson strut shock fails.
What will be an ideal response?
What are several important things to remember in housing rabbits?
What will be an ideal response?
The ill effects of acidity in subsoils can be ameliorated by adding gypsum (CaSO4 • 2H2O) to the soil surface. Which of the following most likely helps account for this effect?
A) Sulfate ions from the gypsum react with H ions in the subsoil to form H2SO4. B) Gypsum stimulates root growth in the surface soil horizons. C) Gypsum dissolves and leaches downward, increasing the Ca/Al ratio in the soil solution in subsoil layers. D) Calcium from the gypsum replaces hydrogen from colloids in the subsoil thereby increasing the soil pH. E) The gypsum replaces hydrogen from colloids which moves down the profile and decreases the pH of the subsoil layers.