Causes of Volcanic Hazards Flashcards
1
Q
What causes explosive volcanic eruptions?
A
High viscosity magma traps gases, leading to pressure build-up and explosive release.
2
Q
What leads to effusive volcanic eruptions?
A
Low viscosity magma allows gases to escape easily, resulting in steady lava flows.
3
Q
Name and describe three volcanic hazards.
A
Lava Flows: Streams of molten rock that can destroy everything in their path.
Ash Fall: Fine particles of volcanic material that can collapse roofs and affect air quality.
Pyroclastic Flows: Fast-moving currents of hot gas and volcanic matter that are extremely destructive.
4
Q
What are lahars and how do they form?
A
Volcanic mudflows formed when volcanic ash and debris mix with water from rainfall or melting snow.
