1. What happens to objects in the path of a landslide? (2 points)
2. What are four natural causes of landslides? (4 points)
3. What are two human activities that can cause landslides? (2 points)
4. Which place mentioned in the text had two severe mudslides in a row? (1 point)
5. What was the problem with the location of the self-built settlements(Favelas) in Rio de Janeiro? (1 point)
2. What are four natural causes of landslides? (4 points)
3. What are two human activities that can cause landslides? (2 points)
4. Which place mentioned in the text had two severe mudslides in a row? (1 point)
5. What was the problem with the location of the self-built settlements(Favelas) in Rio de Janeiro? (1 point)
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1. Slope material that becomes saturated with water may develop a debris flow or mud flow. The resulting slurry of rock and mud may pick up trees, houses, and cars, thus blocking bridges and tributaries causing flooding along its path.
2. Landslides are caused by rain, earthquakes, volcanoes, or other factors that make the slope unstable.
3. Human activities can increase landslide risks. They include clear-cutting, mining and quarrying, bad agricultural practices, and construction activities.
4. 10:36 a.m. A major landslide occurred 4 miles (6.4 km) east of Oso, Washington, United States, on March 22, 2014, at 10:37 a.m. local time.
5. Overcrowding is a major problem in Rio's favelas. On average, the population density is about 37,000 people per square kilometre. Because of the lack of toilets and poor sanitation , sewage often runs in open drains. This causes diseases which spread rapidly.
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