Living In The Environment
18th Edition
ISBN: 9781285969725
Author: G. Tyler Miller, Scott Spoolman
Publisher: Cengage Learning
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Question
Chapter 11, Problem 1CR
To determine
The status of sea turtles and explain the way in which human activities are threatening their existence.
Expert Solution & Answer
Answer to Problem 1CR
Six out of seven species of sea turtles are in danger of extinction. The construction of features to slow beach erosion or the trapping of turtles in commercial and recreational fishing nets causes threatening to their existence.
Explanation of Solution
Sea turtles are considered as one of the most threatened species among all marine species. Currently, six out of seven species of sea turtles are in danger of extinction mainly due to the activities of humans, which take place during the last 100 years. As a result, the number of sea turtles in the world is reduced to about 95%.
Mainly, the number of sea turtles is reduced when the eggs laid down by them are eaten by birds and other predators. In addition, the blockage caused to the female turtles due to seawalls, sandbags, and other devices, which are designed to slow beach erosion in developed coastal areas, also threatens this species. Also, many adult sea turtles die when they are trapped in commercial and recreational fishing nets accidentally or when they become entangled in ocean debris such as plastic bags and lost or abandoned fishing nets.
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Till
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▲ Figure 9.7 This diagram showing common depositional landforms depicts a hypothetical area affected by ice
sheets in the recent geologic past. (Drumlin photo courtesy of Ward's Natural Science Establishment; esker photo by Richard P. Jacobs/
JLM Visuals; kame photo by John Dankwardt; kettle lake photo by Carlyn Iverson/Science Source)
Figure 9.9 is a stereogram showing a portion of the area covered by the Whitewater, Wisconsin, topographic map (Figure 9.10, page 160). Use the stereogram and the map to complete the following.
7. The streamlined, asymmetrical hills composed of till, labeled B, are what type of feature?
8. Examine the shape of the features labeled B on the map in Figure 9.10. How can these features be used to determine the direction of ice flow in a glaciated area?
9. Using the features labeled B in Figure 9.10 as a guide, draw an arrow on the map to indicate the direction of ice movement that occurred in this region.
10. What is the likely location of the outwash plain on the map? Identify and label the area "outwash plain." (Hint: Refer to Figure 9.7.)
11. Label the area covered by ground moraine.
12. What term is applied to the numerous almost circular depressions designated with the letter C?
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