1.3D Flashcards
1
Q
What are pyroclastic flows ?
A
They result from frothing of magma in the vent of the volcano. The bubbles burst explosively to eject hot gases and pyroclastic material which contains glass shards, pumice crystals and ash. They can reach up to 1000 degrees celsius and are responsible for most primary volcano deaths.
2
Q
What is tephra ?
A
Small rock fragments in the atmosphere ejected out from the volcanoes. They affect air travel and cause buildings to collapse
3
Q
What are lava flows ?
A
Streams of fast flowing magma. The viscosity depends on how much silicon dioxide there is in it.
4
Q
What are the volcanic gases ?
A
Water vapour, sulphur dioxide, hydrogen, and carbon monoxide.
