Volcanos

Question 1

Mafic volcanism

Answer 1

Magma produced from melting rocks in asthenosphere and lower mantle

Question 2

Factors that control Explosivity

Answer 2

Magma viscosity-high=most explosive

Volatile content- high= most explosive

Question 3

What are the two kinds of eruptions

Answer 3

Hawiian and Strombolian

Form from oceanic hotspots divergent boundaries and continental rifts

Question 4

Hawiian style

How to erupts

Answer 4

Effusive- gas poor
Last years to decades 
Polygenic - series of eruptions
Fissure
1. Swarm of EQ as fissure opens
2. Lava extrudes creating curtain fire
3.over hours/days eruptions may localize creating fountain fed lava flows

Question 5

Types of Basalt lava flows

Answer 5

A’a and Pahoehoe

Question 6

A’a

Answer 6

Blocky, shape, clunky, high viscosity

Question 7

Pahoehoe

Answer 7

Smooth, Ropey, low viscosity

Question 8

Lava tubes

Answer 8

Far far

Like a pool

Question 9

Hawiian style: What volcanos are built from basalt mafic lava flows

Answer 9

Shield volcanos

Broad and flat

Question 10

Strombolian eruptions

Answer 10

1. Localization of hawiian eruption along a fissure
2. Gases build, gas rich magma erupts in distinct short burst
3. Magma can increase in viscosity and able to trap volatiles
   Last days to months long

Question 11

Strombolian eruptions build what volcanos

Answer 11

Cinder cones

Question 12

Confer cones

Answer 12

Cm sized basalt fragments
Occur in clusters
Build overtime from erupted magma

Question 13

How does volatiles content affect eruptions in cinder cones?

Answer 13

Lower= lava flow
Higher= fire fountain