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Questions and Answers
Lava flows are molten rocks that ooze onto the earth's surface with a temperature of around 500°C.
False
Pyroclastic flows are slow-moving and have temperatures that do not exceed 500°C.
False
The eruption of Mount St. Helens on May 18, 1980, caused a pyroclastic surge that devastated an area of 10 square miles.
False
Earthquakes are not a hazard of volcanic eruptions.
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Mudflows are caused by the mixture of pyroclastic flows with air.
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The eruption of Nevado del Ruiz on November 13th, 1985, caused a lahar that killed around 10,000 people.
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The eruption of Mount Tambora on April 10th, 1815, was the smallest in the recorded history of man.
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The eruption of Mount Tambora caused a global drop in temperature in the year 1816.
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The eruption of Mount St. Helens on May 18, 1980, caused over $10 million in damage.
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What is the temperature range of pyroclastic flows during volcanic eruptions?
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Which natural disaster can be caused by the mixture of pyroclastic flows with water?
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What was the direct cause of an estimated 90,000 deaths after the eruption of Mount Tambora in 1815?
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Which volcanic eruption led to the year 1816 being known as the 'Year Without a Summer'?
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How large was the area devastated by the pyroclastic surge during the Mount St. Helens eruption on May 18, 1980?
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What was the population of the town of Armero in Tolima that was buried and destroyed by an enormous lahar from Nevado del Ruiz in 1985?
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Which disaster caused by volcanoes is characterized by high-speed avalanches of hot ash, rock fragments, and gas?
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Which type of flow consists of molten rocks that burn everything in its path?
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During volcanic eruptions, what disaster can be triggered when pyroclastic flows mix with water?
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