Podcast
Questions and Answers
If a geologist finds a layer of small, rounded volcanic rocks, what size range would these most likely be classified as?
If a geologist finds a layer of small, rounded volcanic rocks, what size range would these most likely be classified as?
- Volcanic bombs
- Lapilli (correct)
- Ash
- Volcanic blocks
Which of the following is the broadest term encompassing all fragmented volcanic ejecta?
Which of the following is the broadest term encompassing all fragmented volcanic ejecta?
- Obsidian
- Pumice
- Basalt
- Tephra (correct)
After a volcanic eruption, residents noticed a fine, dust-like layer covering everything. What is this substance likely composed of?
After a volcanic eruption, residents noticed a fine, dust-like layer covering everything. What is this substance likely composed of?
- Obsidian
- Ash (correct)
- Pumice
- Lapilli
What distinguishes tephra fall from other volcanic phenomena?
What distinguishes tephra fall from other volcanic phenomena?
Which of these volcanic materials is likely to travel the farthest from the eruption site due to its small particle size?
Which of these volcanic materials is likely to travel the farthest from the eruption site due to its small particle size?
Consider a scenario where a town is located close to a volcano. Which type of tephra would pose the most immediate respiratory hazard?
Consider a scenario where a town is located close to a volcano. Which type of tephra would pose the most immediate respiratory hazard?
How does the process of tephra fall primarily affect the surrounding environment during a volcanic eruption?
How does the process of tephra fall primarily affect the surrounding environment during a volcanic eruption?
If a geologist is examining a volcanic deposit and finds angular rock fragments mixed with ash, what process most likely formed this deposit?
If a geologist is examining a volcanic deposit and finds angular rock fragments mixed with ash, what process most likely formed this deposit?
If a town is covered in a thick layer of ash after a volcanic eruption, what would be the safest immediate action for residents to take to protect their health?
If a town is covered in a thick layer of ash after a volcanic eruption, what would be the safest immediate action for residents to take to protect their health?
What is the key difference between ash and lapilli in terms of their formation during a volcanic eruption?
What is the key difference between ash and lapilli in terms of their formation during a volcanic eruption?
How does the density of ash affect its dispersal pattern during and after a volcanic eruption?
How does the density of ash affect its dispersal pattern during and after a volcanic eruption?
Which of the following correctly explains the relationship between tephra and pyroclastic material?
Which of the following correctly explains the relationship between tephra and pyroclastic material?
What is the primary factor that determines whether volcanic ejecta is classified as ash, lapilli, or volcanic bombs?
What is the primary factor that determines whether volcanic ejecta is classified as ash, lapilli, or volcanic bombs?
If a volcanic eruption causes significant tephra fall, what potential long-term impact could it have on agriculture in the surrounding regions?
If a volcanic eruption causes significant tephra fall, what potential long-term impact could it have on agriculture in the surrounding regions?
Which of the following is a direct threat to aviation safety during a volcanic eruption?
Which of the following is a direct threat to aviation safety during a volcanic eruption?
Which type of volcanic ejecta is most likely to form accretionary structures in the atmosphere?
Which type of volcanic ejecta is most likely to form accretionary structures in the atmosphere?
How does the angle of repose of tephra deposits influence the stability of slopes near a volcano?
How does the angle of repose of tephra deposits influence the stability of slopes near a volcano?
During a volcanic eruption, weather patterns can affect tephra dispersal, but which weather condition specifically decreases the fallout?
During a volcanic eruption, weather patterns can affect tephra dispersal, but which weather condition specifically decreases the fallout?
How have tephra deposits aided scientific research and historical understanding?
How have tephra deposits aided scientific research and historical understanding?
What is the relationship between volcanic explosivity and the volume of tephra ejected during an eruption?
What is the relationship between volcanic explosivity and the volume of tephra ejected during an eruption?
Flashcards
Tephra Fall
Tephra Fall
All fragments of rock ejected into the air by an erupting volcano.
Volcanic Ash
Volcanic Ash
Fine particles of pulverized rock, minerals, and volcanic glass created during volcanic eruptions.
Lapilli
Lapilli
Pea- to walnut-size fragments of lava or rock erupted from a volcano.
