PMT - volcanic hazards (the hazards associated with volcanoes) Flashcards
1
Q
what are the main 6 volcanic hazards?
A
lava flows
lahars
tephra
toxic gases
acid rain
pyroclastic flows
2
Q
what can determine the lava flow speed?
A
its viscosity
if there is a higher silica the lava is more viscous so its slower
3
Q
what makes lava more viscous and slow?
A
silica
4
Q
what is a lahar?
A
mudflows
5
Q
what is tephra?
A
any type of rock ejected by the volcano
6
Q
what is acid rain caused by?
A
when sulphur dioxide is released into the atmosphere mixing with precipitation
7
Q
what is a pyroclastic flow?
A
clouds of burning hot ash and gas that collapses down a volcano at high speeds
8
Q
what is the average speed of a pyroclastic flow?
A
60mph but can reach up to 430mph
