Volcanic Hazards Flashcards
(9 cards)
1
Q
tephra
A
ash falls
is a solid material of varying grain size (fine ash up to volcanic bombs) ejected into the atmosphere
2
Q
example of a tephra
A
2010 eruption of Mount Merapi in Indonesia
353 died
3
Q
impacts of tephra
A
Buildings often collapse under the weight of ash falling on to their roofs.
Air becomes thick with ash and is very difficult to breathe in and can cause respiratory problems.
4
Q
volcanic gas
A
poisonous
e.g. sulphuric acid
5
Q
pyroclastic flows
A
800°C
mixture of gas and tephara
destroy everything
6
Q
example of pyroclastic flow
A
Mt st helens 1980
7
Q
lava flow
A
slow moving
incredibly hot
8
Q
lahara
A
secondary hazard
fast mudflows that happen when rain mobilises deposits of volcanic ash.
9
Q
jökulhlaup
A
flooding that happens when glaciers or ice caps melt.
