P R O G R A M
C O N T E N T S
Segment 4 - Sustaining Living Systems in a Changing World Integrated Phenomenon: Dams affect river ecosystems whether they are natural, like the one at Quake Lake, or manmade, like the Hoover Dam.
Earth’s Natural Hazards
Anchoring Phenomenon: Bridges in some places risk damage or destruction from multiple natural hazards including flooding, mass wasting, earthquakes, and even volcanic activity. 25 Volcanic Eruptions and Earthquakes
Phenomenon: Volcanoes erupt and earthquakes shift the ground at similar places around the globe, but there are other places that see very little earthquake and volcanic activity.
26 Mass Wasting, Tsunamis, and Floods
Phenomenon: Data on maps shows that Northen California has more mass wasting than Missouri, even though Missouri has more floods. Engineering Challenge: Designing a Bridge for Floods and Landslides Performance Assessment: Planning Bridges to Withstand Natural Hazards Anchoring Phenomenon: Bridges in some places risk damage or destruction from multiple natural hazards including flooding, mass wasting, earthquakes, and even volcanic activity.
Humans and Changing Ecosystems
Anchoring Phenomenon: Abalone populations in southern California have been declining steadily since the 1960s. 27 Biodiversity
Phenomenon: The kakapo is a flightless parrot that lives in New Zealand. In the 1970s, only 18 individuals were left alive; now there are about 160 living individuals.
28 The Importance of Healthy Ecosystems
Phenomenon: Almond farms in California truck in billions of honey bees from around the nation to pollinate their orchards each spring.
29 Engineering Solutions and Protecting Ecosystems
Phenomenon: The populations of wild animals, such as the lynx and rabbit, tend to rise and fall in cycles, but the global human population is just rising—dramatically. Engineering Challenge: Designing a Fishing Net Performance Assessment: People and Ecosystems Anchoring Phenomenon: Abalone populations in southern California have been declining steadily since the 1960s.
Using Your Model to Explain the Phenomenon
Return to the model created at the beginning of the segment, and revise it based on what you learned about Earth’s natural hazards and humans and changing ecosystems. Then, use your model to explain the Integrated Phenomenon.
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