Volcanic Activity Flashcards
1
Q
What is the difference between magma and lava?
A
Lava turns to magma when it reaches the surface
2
Q
Name the three tectonic settings that are associated with volcanic activity.
A
Subduction zones, spreading centres, and hot spots
3
Q
List the materials that are ejected during volcanic eruptions ?
A
Lava, volcanic gases, pyroclastic material,
4
Q
What is the main volcanic zone in the world?
A
The Pacific Ring
5
Q
How many volcanoes erupt every year?
A
About 50-60 volcanoes erupt every year.
20-30 are effusive (lava flows), 20-30 are explosive
