11. Volcanoes: types (by formation)

Question 1

shield distribution
vs
strato distribution

Answer 1

commonly near divergent PB
vs
commonly near convergent PB

Question 2

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

Answer 2

Erta Ale, Ethiopia
vs
Mt. Pinatubo, Philippines

Question 3

lava of shield
vs
lava of strato

Answer 3

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)

Question 4

eruption of shield
vs
eruption of strato

Answer 4

usually not explosive
vs
very explosive

Question 5

height of shield
vs
height of strato

Answer 5

400 - 610m
vs
↑2500m

Question 6

shape of shield
vs
shape of strato

Answer 6

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