Magma

Question 1

Decompression melt

Answer 1

Decrease pressure
Hot rock rise toward surface
Temp constant; pressure decrease
Divergent and hot spots

Question 2

Volatiles

Answer 2

H20, CO2

Question 3

Addition of volatiles

Answer 3

Are heated and released into rock,
addition of water lower melting temp of rock by breaking chemical bonds
Temp and pressure are constant
Subduction zones

Question 4

Addition of heat

Answer 4

Pressure constant; temp increase
Melting of lithosphere as magma rises through surface
Changes composition of magma

Question 5

What differs volcanos

Answer 5

Magma chemistry
Temp of magma
Volition content
Size of length of eruption

Question 6

Viscosity

Answer 6

How magma flows; resistances to fluid
High viscosility=thick like peanut butter
Increases with decreasing temp (maple syrup)
Increases with Silica content (add more flour-thicker)
Increase with increase crystal content

Question 7

Volatile (gas) content

Answer 7

Amount determines explosity of volcano
Gas rich=explosive
Gas poor=effusive
Fragmentation- quickly when pressure decreases rapidly

Question 8

Magma properties (classification)

Answer 8

Silica content
Magma temp
Magma viscosity
Volatile content
Explosity

Question 9

Type of magma

Answer 9

Magic
Intermediate
Felsic

Question 10

Mafic

Answer 10

Silica-50
Temp-1200 C
Viscosity-low
Volatile-low
Explosity-low
Less silica content, highest temp, lowest in everything else

Question 11

Intermediate

Answer 11

Silica-60
Temp-1830 F
Viscosity- medium
Volatile- medium
Explosity-medium
Medium in everything

Question 12

Felsic

Answer 12

Silica-70
Temp-800 C
Viscosity-high
Volatile-high
Explosity-high
Lowest temperature but highest in everything else
Light color to its rocks