Determine the soil texture for the following combinations of sand, silt, and clay.
Using Figure 27-1, the standard soil texture triangle, answer the question.
(a) Sand 20 percent; Silt 20 percent; Clay 60 percent: _________________________
(b) Sand 60 percent; Silt 30 percent; Clay 10 percent: _________________________
(c) Sand 50 percent; Silt 10 percent; Clay 40 percent: _________________________
(a) Clay
(b) Sandy loam
(c) Sandy clay
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Natural capital is that which is created by
A. Animal labor B. Human labor C. Industrial processes D. Natural Earth processes E. All of these are ways natural capital is created
What evidence has shown conclusively that the oceanic crust is geologically young and that the parallel magnetic striping pattern of basalts is symmetrical with regard to oceanic ridges?
A)radiometric dating of oceanic basalts and sequences from continents exclusively B)the unusually thin layer of oceanic sediments and ages of contained fossils exclusively C)the existence of the same magnetic anomaly patterns in all ocean basins D)radiometric dating of oceanic basalts and sequences from continents AND the unusually thin layer of oceanic sediments and ages of contained fossils E)magnetic reversals contained in continental crusts that were at one time oceanic basalts
Dams provide an important source of ________
A) electricity B) water flowing into lakes C) nonrenewable energy D) renewable energy E) stabilization for migrating fish to reproduce
What two factors cause horizontal variations in air pressure?
a. thermal and dynamic b. thermal and static c. wind and rain d. cold air and warm air