Primary Volcanic Hazards Flashcards
1
Q
What is a lava flow?
A
A mass of flowing lava which crushes and burns everything in its path
2
Q
What do lava flows sometimes do?
A
Melt ice and snow to cause flooding
3
Q
What are lava flows expelled through?
A
Fractures and cracks in the earths crust
4
Q
What are volcanic gases?
A
Gases which are released into the atmosphere during an eruption
5
Q
What are some types of volcanic gases?
A
Co2
Carbon monoxide
Sulfur oxide
Hydrogen sulfide
6
Q
What do pyroclastic flows contain?
A
A high density mix of hot lava blocks, ash and gas
7
Q
What are the 3 ways in which pyroclastic flows can form?
A
- Collapse of eruption column
- Boiling over from eruptive vents
- Collapse of lava domes
8
Q
What are the 2 parts which pyroclastic flows consist of?
A
- Lower flow of fragments
2. Turbulent cloud of ash
9
Q
What is tephra?
A
Fragments of rock which are produced when magma is explosively ejected
