In terms of porosity and permeability, why is loam often considered the ideal soil texture for agriculture?
Using Figure 27-1, the standard soil texture triangle, answer the question.
What will be an ideal response?
Loam soils have both moderately high porosity to hold water, and moderate permeability that prevents them from drying out too quickly.
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Albedo describes the reflectance of radiation off of a surface. How could the reduction of ice sheets and glaciers at the north and south poles cause changes in Earth's surface temperatures? 
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A. The greenhouse effect would be greatly reduced and Earth's surface would heat up closer to that of Venus. B. More CO2 in the atmosphere will cool the Earth. C. The loss of high-albedo snow and ice would increase the absorbance of radiation, heating Earth's surface. D. Reduction of water vapor in the atmosphere would result in Earth's surface cooling down.
Total fertility rate (TFR) is the same as crude birth rate (CBR).
A. Yes B. No
Of the following anthropogenic methane (CH4 ) sources, which is the largest?
A) livestock B) wastewater treatment C) agriculture associated fires D) rice paddies
Road building in forests can lead to fragmentation as well as erosion.
Answer the following statement true (T) or false (F)