Principles of Environmental Science
8th Edition
ISBN: 9780078036071
Author: William P Cunningham Prof., Mary Ann Cunningham Professor
Publisher: McGraw-Hill Education
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Question
Chapter 4, Problem 1AL
To determine
The population doubling time if it is growing at the rate of
1.1
Expert Solution & Answer
Answer to Problem 1AL
Doubling time is the time required for doubling a quantity. For the world population approximately
Explanation of Solution
Doubling time is defined as the time period which is required for doubling a quantity. Population doubling time is the time which is required for doubling the present human population size.
The doubling time of a population can be calculated by the rule of
As,
So, approximately
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44) In periglacial environments, the layer of ground that thaws every summer and freezes every winter is called
A) frost layer
B) permafrost
C) active layer
D) discontinuous permafrost
Use the attached piezometer map to make your own, clean version of the map, and indicate the elevation of the water table at all piezometer locations.
Draw equipotential lines (lines of equal water table elevation) using regular intervals – creating a contoured map of the water table.
Determine the direction of groundwater flow based on the horizontal gradient. Label the areas of recharge and discharge directly on your map.
Flow lines: Draw flow lines on your water table map. The lines should be at right angles to the equipotential lines and extend from the recharge area to the discharge area.
Hydraulic Gradient, Specific Discharge (Darcy Flux), Average Linear Velocity:
Using your water table map, estimate an average hydraulic gradient between two locations, call them locations A and B, one at the eastern-most and a second at the western-most extent of your dataset (note the north arrow on the map).
Calculate the specific discharge, q, between the two locations. For this calculation…
Calculate all the values of table 1:
Q in (L/day)
Q out (L/day)
Residence time (days)
Please show all steps
Chapter 4 Solutions
Principles of Environmental Science
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