Library
Public
Team Premium
Grades
Kindergarten
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th
Higher Ed
Adult Ed
Other
Subjects
ELA
Math
Science
Social Studies
Art
Computer Science
French
German
Music
Physical Education
Spanish
Other
Volcanic Hazards
starstarstarstarstarstarstarstarstarstar
by George Hume
| 10 Questions
Note from the author:
volcanic hazards
1
1 pt
It can cause a lot of damage to crops and property, but rarely cause deaths. By the time they reach the lower slopes of the mountain, the local population has usually been evacuated.
Poisonous gases
Ash
Tsunamis
Lahars/mudflows
Directed blast
Pyroclastic flow
Lava bombs
Acid rain
Lava flow
Landslides
2
1 pt
Near the site of the eruption, large lumps of lava cool as they fly through the air. Little damage is inflicted as these projectiles travel relatively short distances.
Poisonous gases
Ash
Tsunamis
Lahars/mudflows
Directed blast
Pyroclastic flow
Lava bombs
Acid rain
Lava flow
Landslides
3
1 pt
Most eruptions produce vast quantities of this. It may be carried hundreds of kilometers from the crater by the prevailing wind. It can block out the sun and even affect the climate. Major damage can be caused close to the eruption, where it covers everything with a thick layer. Settlements and fields can be buried and buildings collapse under the weight of it.
Poisonous gases
Ash
Tsunamis
Lahars/mudflows
Directed blast
Pyroclastic flow
Lava bombs
Acid rain
Lava flow
Landslides
4
1 pt
When dormant volcanoes are plugged by solid lava in the vent, the gas pressure in the magma may build up. Sometimes this hot gas, filled with suspended ash, is released in a sudden explosion from the top or side of the volcano. The cloud moves down the slope at up to 200km/hr, flattening everything it its path. Anyone breathing the fiery cloud dies almost instantly. In Martinique in 1902, 30,000 were killed in a few minutes which came from Mont Pelee and hit the town of St Pierre.
Poisonous gases
Ash
Tsunamis
Lahars/mudflows
Directed blast
Pyroclastic flow
Lava bombs
Acid rain
Lava flow
Landslides
5
1 pt
Produced during eruptions and include compounds of sulphur, carbon monoxide and carbon dioxide. These heavy gases hug the ground and can kill people, wildlife and plants without warming. In Cameroon in 1986 1500 died in their sleep.
Poisonous gases
Ash
Tsunamis
Lahars/mudflows
Directed blast
Pyroclastic flow
Lava bombs
Acid rain
Lava flow
Landslides
6
1 pt
Many volcanoes support permanent snow and ice caps. Eruptions rapidly melt the snow and ice producing creating a flash flood. Heavy rain from thunderstorms mixes with volcanic ash to produce a thick paste which moves rapidly down river valleys burying fields, settlements and people. In Armero, Colombia an entire town was wiped out in 1985.
Poisonous gases
Ash
Tsunamis
Lahars/mudflows
Directed blast
Pyroclastic flow
Lava bombs
Acid rain
Lava flow
Landslides
7
1 pt
Eruptions beneath the ocean or on volcanic islands can produce a wave that travels across entire oceans. Krakatoa in 1883 killed 36,000 when the volcanic island exploded, creating a 35 m high wave which destroyed 300 towns in Java and Sumatra.
Poisonous gases
Ash
Tsunamis
Lahars/mudflows
Directed blast
Pyroclastic flow
Lava bombs
Acid rain
Lava flow
Landslides
8
1 pt
Typically a large eruption column is forced upwards into the atmosphere forming a mushroom shaped cloud, however, this hazards can occur as in the case of Mt St Helens when the energy was released sideways releasing the pressure that had built up for weeks.
Poisonous gases
Ash
Tsunamis
Lahars/mudflows
Directed blast
Pyroclastic flow
Lava bombs
Acid rain
Lava flow
Landslides
9
1 pt
The steep sides of many strato volcanoes can be very unstable. Material may become unstable after tremors (earthquakes) or after an eruption.
Poisonous gases
Ash
Tsunamis
Lahars/mudflows
Directed blast
Pyroclastic flow
Lava bombs
Acid rain
Lava flow
Landslides
10
1 pt
Carbon dioxide, sulphur dioxide and other compounds combine with water in the atmosphere above the volcano to produce a substance that can destroy the surrounding vegetation and kill much of the life in lakes and rivers.
Poisonous gases
Ash
Tsunamis
Lahars/mudflows
Directed blast
Pyroclastic flow
Lava bombs
Acid rain
Lava flow
Landslides






………………………………….. When dormant volcanoes are plugged by solid lava in the vent, the gas pressure in the magma may build up. Sometimes this hot gas, filled with suspended ash, is released in a sudden explosion from the top or side of the volcano. The cloud moves down the slope at up to 200km/hr, flattening everything it its path. Anyone breathing the fiery cloud dies almost instantly. In Martinique in 1902, 30,000 were killed in a few minutes which came from Mont Pelee and hit the town of St Pierre.

………………………………….. Produced during eruptions and include compounds of sulphur, carbon monoxide and carbon dioxide. These heavy gases hug the ground and can kill people, wildlife and plants without warming. In Cameroon in 1986 1500 died in their sleep.
………………………………….. Many volcanoes support permanent snow and ice caps. Eruptions rapidly melt the snow and ice producing creating a flash flood. Heavy rain from thunderstorms mixes with volcanic ash to produce a thick paste which moves rapidly down river valleys burying fields, settlements and people. In Armero, Colombia an entire town was wiped out in 1985.
………………………………….. Eruptions beneath the ocean or on volcanic islands can produce a wave that travels across entire oceans. Krakatoa in 1883 killed 36,000 when the volcanic island exploded, creating a 35 m high wave which destroyed 300 towns in Java and Sumatra.

………………………………….. Typically a large eruption column is forced upwards into the atmosphere forming a mushroom shaped cloud, however, this hazards can occur as in the case of Mt St Helens when the energy was released sideways releasing the pressure that had built up for weeks.
………………………………….. The steep sides of many strato volcanoes can be very unstable. Material may become unstable after tremors (earthquakes) or after an eruption.

………………………………….. Carbon dioxide, sulphur dioxide and other compounds combine with water in the atmosphere above the volcano to produce a substance that can destroy the surrounding vegetation and kill much of the life in lakes and rivers.
Add to my formatives list