Prevention and Cause of volcanic eruptions

Definitions for commonly used terms

Hazard– thing (usually has dates)

Risk– chance/likeliness

Disaster– occurence

 

Volcanic Features

Eruption column and cloud– volcanic ash emitted during volcanic explosion. Ash forms a column rising many km into air above peak of volcano. Eruption cloud- cloud that forms when volcano erupts. Lung problems, harm ecosystem.

Volcanic gases– Gas ejected of volcanoes during eruption.

Lava flow and domes– Lava dome is created by volcanic eruption. Forms when lava flow is too thick to flow, and piles up on the side, creating a steep side. Lava flow- movement of lava created during non-explosive eruption.

Pyroclastic Flows– Flow of ash, rocks, and gas down the volcano, carrying everything on its pathway.

Lahars– Type of mudflow, contains: pyroclastic material, rocky debris, and water.  Over 60km/hour. Material flows down volcano, occurs along river valley.

Edifice collapse– Structure of volcano collapse.

Hot springs and Geysers– Hot springs- Warm water above body temperature. Heated naturally. Above ground. Geyser- When spring releases hot water and steam into water, from hole in ground. Occurs due to build up of pressure.

Other notes: http://greenfieldgeography.wikispaces.com/IGCSE+Plate+Tectonics+and+GCSE+Plate+Tectonics

Noted from video.

 

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