Snow insulates the ground well because:
a. the air between the individual snowflakes allows shortwave radiation to penetrate the snow and warm the ground
b. the air between the individual snowflakes is a good insulator.
c. ice is a better insulator than air.
d. All of these choices.
b
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Smog, the product of NOX, sunlight, and ________, is created by chemical reactions that occur in the atmosphere
A) carbon monoxide B) sulfur oxides C) hydrocarbons D) particulates
"The oceanic crust is older than the continental crust because it is deeper." Evaluate this statement
A) This statement is true. The continental crust floats much higher on Earth's surface than the oceanic crust. B) This statement is false. The oceanic crust experiences more subduction and is younger than the continental crust. C) This statement is true, but the speaker should have also mentioned that the oceanic crust is known to be older by the type of rock it is (basalt). D) This statement is false. The land that is now considered continental was previously oceanic crust, so this comparison is meaningless.
Which one of the following soil horizons is least likely to interact directly with living organisms?
A) A horizon B) O horizon C) E horizon D) C horizon
Harvesting fuelwood at unsustainably high rates often leads to ________
A) soil erosion and desertification B) increases in soil fertility C) more land being available for corn fields D) removal of pest insect species E) higher levels of plant biodiversity