volcanic hazards

Question 1

what are lava flows?

Answer 1

Lava can flow quickly or slowly depending on the viscosity. silica makes larva viscous and slow, which is common in explosive eruptions.

Question 2

what are lahars?

Answer 2

(mudflows)- these are caused by a number of reasons, usually by melting ice at high latitudes.

Question 3

what are glacial floods (jokullhuaups)

Answer 3

when the temperatures are too high from magma, glaciers or ice sheets at high temperature quickly melt and large amounts of water is discharged.

Question 4

what is tephra?

Answer 4

this is any type of rock ejected by a volcano.

Question 5

what are toxic gases?

Answer 5

this his the released during some eruptions, even co2 can be toxic as it can replace oxygen as it is heavier.

Question 6

what is acid rain?

Answer 6

this is caused when gases such as sulphur dioxide are released into the atmosphere.

Question 7

what are nuees ardentes/ pyroclastic flow?

Answer 7

this is clouds of brining hot ash and gas that collapse down a volcano at high speeds. the average speeds are around 60mph but can reach speeds of 430mph