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TITLE OF VIDEO: Understanding Volcanoes VIDEO COMPREHENSION QUESTIONS: 1. Why are volcanoes considered one of the most powerful natural forces? 2. Generally, how do volcanoes form? 3. What type of eruption results from a plate being forced under another? 4. What is a pyroclastic flow? 5. Give three examples of how people adapt to the threat of volcanic eruptions. 6. How is volcanic activity monitored? 7. How do volcanologists measure the speed of flowing lava? 8. What could happen to Earth as a result of a huge volcanic eruption? DiscoverySchool.com http://www.discoveryschool.com Copyright 2001 Discovery.com. Teachers may reproduce copies of these materials for classroom use only. See next page for answers. Understanding Volcanoes VIDEO COMPREHENSION QUESTIONS AND ANSWERS: 1. Why are volcanoes considered one of the most powerful natural forces? Volcanoes can destroy everything around them without any warning and block out the sun for long periods of time, making them one of the most powerful of natural forces. 2. Generally, how do volcanoes form? Volcanoes result from the movement of tectonic plates. Volcanoes tend to form at the edges of these plates. 3. What type of eruption results from a plate being forced under another? Explosive eruptions result from a plate being forced under another. Ocean water in the sediment forms steam and adds to gas load (pressure). 4. What is a pyroclastic flow? Pyroclastic flows are lateral eruptions containing gases, rock, and ash traveling at high speeds. 5. Give three examples of how people adapt to the threat of volcanic eruptions. To adapt to volcanic eruptions, school children wear hard hats to school to protect themselves from volcanic debris, they put roofs over graves in cemeteries, they build bridges that provide shelter during an eruption. 6. How is volcanic activity monitored? Local gravity, gas output, and earthquake measurements can monitor volcanic activity. 7. How do volcanologists measure the speed of flowing lava? Volcanologists measure the speed of flowing lava with a radar gun. 8. What could happen to Earth as a result of a huge volcanic eruption? In a large-scale volcanic eruption, the sun could be blotted out, plants would die, the food supply would dwindle, and a new ice age could begin. DiscoverySchool.com http://www.discoveryschool.com Copyright 2001 Discovery.com. Teachers may reproduce copies of these materials for classroom use only.
