Which of the following best describes how the process of irrigation can lead to salinization of soils?
a. Water associated with irrigation flows from uphill. The salts that were in the soil uphill end up being brought to the lower elevations.
b. Water associated with irrigation contains small amounts of dissolved salts. Evaporation leaves behind increasing concentrations of these salts.
c. Irrigation water contains salts. Evaporation allows the salts to be lifted away, reducing the levels of salts in the soil.
d. Irrigation water is treated with dissolved salts to promote plant growth. Over time the plants become saturated with salts and do not need this macronutrient.
e. Irrigation is primarily accomplished through the use of abundant sea water, which contains high concentrations of salts.
B
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Answer the following statement true (T) or false (F)
What would happen to July temperatures in Australia if Earth's rotation axis increased to 25 degrees?
A. average temperatures would decrease B. average temperature would stay the same C. average temperature would increase
The amount of space between the particles that make up sediments or rocks is called _______________
Fill in the blank(s) with correct word
All of the following is true about Britain's colonial policy on Australia, except:
A) over 160,000 convicts were sent to the colony B) settlers produced their own food in Australia C) settlers and Aboriginal communities had conflict D) wheat was grown in Derwent Valley E) over 160,000 convicts were sent to the colony; settlers produces their own food in Australia