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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.
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.
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.
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.
Earthquakes are not a hazard of volcanic eruptions.
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Mudflows are caused by the mixture of pyroclastic flows with air.
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.
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.
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.
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.
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?
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?
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?
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'?
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?
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?
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?
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?
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?
During volcanic eruptions, what disaster can be triggered when pyroclastic flows mix with water?
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