Volcanoes 2

Question 1

Ways in which nature melts rocks

Answer 1

• divergent margin
• heat melting/hot spots
• convergent margin

Question 2

Basaltic Magma

Answer 2

-Low in SiO2
45-55 Wt%
high in Fe,Mg,Ca
Low in K,Na
no quartz

Question 3

Andesitic Magma

Answer 3

-Intermediate in SiO2
-55-65% wt
intermed in Fe,Mg,Ca,Na,K
some quartz

Question 4

Rhyolitic

Answer 4

-high in SiO2
-65-75% wt
low in Fe,Mg,Ca
High in K,Na
lots of quartz

Question 5

Temperature of Basaltic

Answer 5

1000 to 1200 C

Question 6

Temperature of Andesitic

Answer 6

800 to 1000 C

Question 7

Temperature of Rhyolitic

Answer 7

650 to 800 C

Question 8

Non explosive eruptive Style

Answer 8

• low silica
• low gas content
• basaltic lava flows

Question 9

Explosive

Answer 9

• high silica
• high gas content
• pyroclastic
• andesitic

Question 10

lava fountain

Answer 10

benign gas emission from low viscosity magma and formation of cinder cone