Impacts of volcanic activity

Question 1

What is tephra?

Answer 1

a solid material of varying grain size ranging from volcanic bombs to ash, ejected into the atmosphere

Question 2

What are pyroclastic flows?

Answer 2

• very hot (over 800 degrees)
• gas charged
• high velocity flows
• made up of gas&tephra
• hug the ground
• flow downhill
• speeds of up to 700km/h

Question 3

What are volcanic gases?

Answer 3

• carbon dioxide
• carbon monoxide
• hydrogen sulphide
• sulphur dioxide
• chlorine

Question 4

What are lahars?

Answer 4

• melted snow and ice combined with volcanic ash

- high speeds