Living in the Environment
18th Edition
ISBN: 9781133940135
Author: G. Tyler Miller
Publisher: CENGAGE L
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Chapter 12, Problem 4CR
To determine
The difference between crossbreeding through artificial selection and genetic engineering. Describe the second green revolution based on genetic engineering. Describe the growth of industrialized meat production. Define feedlots and CAFOs. Definition of fishery, aquaculture. Explain the reason why industrialized food production requires large inputs of energy and why does it result in a net energy loss.
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A 40-cm circular PPC pile is driven to a depth of 20 meters in the soil conditions shown
below. Calculate the (a) shaft resistance in the clay layer using the alpha method and the
(b) shaft resistance in the sand layer using the beta method.
Depth (m)
14
20
30
Stiff Clay
y = 19.8 kN/m³
Su = 130 kPa
a = 0.58
20-
Dense Sand
y = 18.8 kN/m³
Q=35º
8 = 2/34
Figure 12.7:
A.
B.
A.
B.
C.
D.
E.
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