Of all the human-caused gases, which gas makes the greatest relative contribution to increasing the greenhouse effect?
a) hydrogen
b) methane
c) carbon dioxide
d) oxygen
e) ozone
C
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In North America "no till farming" has become a widespread practice made possible by genetically modified (GM) crops that can be sprayed with herbicide that kills everything but the GM plant
Evaluate the following statements on the role of GM crops on soil conservation issues? A) The herbicides kill beneficial plants and animals and eventually will make the soil sterile. B) The no till practice dramatically improves soil conservation by providing loose organic matter cover to the soil surface, breaking up wind and runoff, lowering erosion rates. C) They are a disaster. By killing all plants except the GM organism they expose the soil to increased erosion. D) They have no effect one way or the other on soil erosion.
Which weathering process is illustrated in this image?
A) Exfoliation B) Root wedging C) Hydrolysis D) Frost wedging
What is the lowest elevation shown on the basin floor?
The following questions are based on Map T-10, the “Furnace Creek, California” quadrangle (scale 1:62,500; contour interval 80 feet; dotted lines represent 20-foot contours). This portion of the Furnace Creek quadrangle shows the Panamint Range and the western side of Death Valley in Death Valley National Park (36°19'08"N, 116°53'25"W). Several large alluvial fans can be seen along the eastern front of the Panamint Range. The basin floor here is called the Death Valley “salt pan,” because salts have accumulated here in great thicknesses. What will be an ideal response?
Which kind of rock often forms caves?
A. Granite B. Shale C. Sandstone D. Limestone