11. Volcanoes: types (by formation) Flashcards Preview

plate tec memorising > 11. Volcanoes: types (by formation) > Flashcards

Flashcards in 11. Volcanoes: types (by formation) Deck (6)
Loading flashcards...
1
Q

shield distribution
vs
strato distribution

A

commonly near divergent PB
vs
commonly near convergent PB

2
Q

e.g. of shield
vs
e.g. of strato

A

Erta Ale, Ethiopia
vs
Mt. Pinatubo, Philippines

3
Q

lava of shield
vs
lava of strato

A
basic lava
- low silica (trap ↓ gas, ↓ explosive)
- low viscosity (flow short dist. before solidifying)
- temp (↓ 900°C)
vs
acid lava
- high silica (trap ↑ gas, ↑ explosive)
- high viscosity (flow long dist. before solidifying)
- temp ↑ (1160°C)
4
Q

eruption of shield
vs
eruption of strato

A

usually not explosive
vs
very explosive

5
Q

height of shield
vs
height of strato

A

400 - 610m
vs
↑2500m

6
Q

shape of shield
vs
shape of strato

A

gentle-slopping sides, broad base
vs
steeper at top, gentler at base, secondary cones present