Hazards of a volcanic eruption

Which of the hazards is made out of lava which has been blown apart and cooled?

• lahar

• ash

• pyroclastic flow

• lava bomb

How does ash cause harm to people?

• planes cannot travel so there will be a fall in the economy

• ash is very expensive to clear as it will not dissolve in water.

• ash will cause irritation to the eyes and will create a concrete mixture in the lungs if it is breathed in.

What are the two types of gases that are released in an eruption?

• oxygen

• carbon dioxide

• nitrogen

• sulphur dioxide

Why would CO2 be dangerous to local villages

• CO2 is more dense than oxygen and can push air up.

• CO2 causes suffocation

• CO2 has no smell and cannot be seen so people do not know that it is coming.

• All of the above

Which hazard shown in the image will set like concrete when it comes to a halt?

• pyroclastic flow

• ash

• lahar

• lava bomb

Which type of lava is slow moving and less dangerous as shown in the picture?

• High viscosity lava

• low viscosity lava

Why is low viscosity lava dangerous ?

• Contains more gas so only travels 40 mph

• Contains less gas so travels 60mph so it is hard to outrun

• will damage buildings and infrastructure

• Can travel as far as 60m before cooling.

What is the name of the hazard in the image?

• lahar

• toxic gases

• ash

• pyroclastic flow

What are the correct facts about why a pyroclastic flow is dangerous?

• fast at 100mph

• High temperatures reaching to temperatures of 500 C

• cannot outrun as they travel at upto 500 mph

• only travel short distances

• made of hot toxic gasses like S02.

Which do you think is the deadliest hazard so far?

• pyroclastic flow

• toxic gasses

• low and high viscosity lava

• lahars

• lava bombs