1.4 Understanding Volcanic Eruptions Flashcards
1
Q
Lava
A
When magma emerges from the earth’s surface
2
Q
Pyroclastic flow
A
Mixture of dense hot rock, lava, ash and gases ejected from a volcano. Fast moving. Very destructive.
3
Q
Tephra
A
Pieces of rock and Ash erupting from a volcano during eruption.
4
Q
Lahar
A
Masses of rock, mud and water that travel quickly down a volcanoes side. Similar to landslides
5
Q
Volcanic Explositivity Index (VEI)
A
Describes and compares magnitudes of volcanic eruptions. Uses a logarithmic scale from 1 to 8. Includes factors such as height & mass of tephra and ash fall, Length of eruption
6
Q
Examples of precursors
A
Small earthquakes, changes to surface of volcano. Changes to the tilt of a volcano.
