mafic volcanoes

Question 1

viscosity of mafic volcanoes

Answer 1

low

Question 2

flow distance of mafic volcanoes

Answer 2

far - can be several km

Question 3

gas content of mafic volcanoes

Answer 3

high

Question 4

explosiveness of mafic volcanoes

Answer 4

despite high gas content, low viscosity allows gas to esacpe quickly so eruptions are quiet/non violent (0-1 on VEI) EFFUSIVE

Question 5

classification of mafic volcanoes

Answer 5

hawaiin

Question 6

location of mafic volcanoes

Answer 6

divergent plate margins or hotspots

Question 7

frecquency of eruption of mafic volcanoes

Answer 7

frequent (every few years or less)

Question 8

what is a shield volcano?

Answer 8

made up of thin basalt flows from cenrtal vent
fissure eruptions
less than 10 degree slopes

Question 9

what is a fissure eruption?

Answer 9

where magma reaches surface along linear cracks or fissures

Question 10

term used to describe fluid non-explosive basalt lava

Answer 10

EFFUSIVE

Question 11

what is columnar jointing

Answer 11

where lava flows are over 3m thick, inside cools slower causeing hexagoal columns to form in centre due to contraction. cooling originates at equally spaced centres then spreadsd in all direcitons forming cracks inbetween each centre

Question 12

volcanic explositivy index (VEI)

Answer 12

0-8

relative siz/magnitude of explosive volcano eruptions

Question 13

volcanic classifictaion

Answer 13

Hawaiian
strombolian
vulcanian
pelean
plinean
ultra pilean