Sheild Volcanoes Flashcards
1
Q
Lava plateaux
A
When lava erupts from multiple fissures, vast areas can be covered by free flowing lava. These events are known as flood basalts
No large scale flood basalts have happened in the last 50 million years and they have a large impact of the atmosphere, hydrosphere and biosphere
EXAMPLE: Deccan Plateau in central India which covers more than 500 000 km^2
2
Q
What type of eruption coincides with divergent plate boundaries?
A
Effusive
3
Q
What type of viscosity is the lava from effusive eruptions?
A
Low
4
Q
Characteristics of magma
A
Basaltic
High temperature
Low silica content
