Impacts of volcanic activity Flashcards
1
Q
Primary
A
- Tephra
- Pyroclastic flows
- Lava flows
- Volcanic gases
2
Q
Tephra
A
- Ash and pumice that’s ejected during a volcanic eruption
- Deposited on a landscape
3
Q
Pyroclastic flows
A
- 800c
- Very hot
- Gas charged
- High-velocity flows made up of a mixture of gas and tephra
- Hug the ground and flow down
- 700km per hour
4
Q
Lava flows
A
- Least hazardous
- Streams of molten rock that pours from erupting vent
5
Q
Volcanic gases
A
- CO2
- Carbon monoxide
- Hydrogen sulphide
- Sulphur dioxide
- Chlorine
6
Q
Secondary
A
- Lahars
- Flooding
- Volcanic landslides
- Tsunamis
- Acid rain
- Climatic change
7
Q
Lahars
A
- Melted snow and ice combined with ash = mud flows
- Move down at high speeds
8
Q
Flooding
A
- Eruption melts glaciers and ice caps
= Serious flooding
9
Q
Volcanic landslides
A
- Large masses of wet or dry rocks and soil
- Fall, slide and slow rapidly under the force of gravity
- High velocity and momentum
10
Q
Tsunamis
A
- Sea waves generated by violent volcanic eruptions
11
Q
Acid rain
A
- Volcanic emit gases; sulphur
= Combines with atmopsheric moisture
12
Q
Climate change
A
- Ejection of massive amounts of volcanic debris into atmosphere
= Reduce global temps
13
Q
Social impacts
A
- People killed
- Infrastructure destoryed by pyroclastic flow and tephra
- Fires may start
14
Q
Political
A
- Damage to agricultural land
= Food shortage = conflict and political unrest
15
Q
Economic
A
- Businesses destroyed
- Ash cloud prevent aircraft
- Crops damaged = damage economy
- Repair infrastructure = expensive
- Toursits may be attracted = boosting economy
