FDSCI 201 EXAM 2 Part 1
(Volcanoes)
What is the difference Between Magma and Lava? - ANSWERSMagma- Inside the earth's surface
Lava- Outside the earth's surface
How is magma produced in the Mantle? - ANSWERSDecompression Melting, Volatile Fluxing,
Heat Transfer
How does Viscosity control Magma Properties? - ANSWERSIt determines how the lava flows.
The more Viscosity, the less distance the magma can spread.
How do Volatiles control Magma Properties? - ANSWERSIt is the pressure of the magma. The
more Volatiles present, the bigger the pop!
How does Temperature control Magma Properties? - ANSWERSThe more heat, the less viscosity.
The less viscosity, the more distance the magma can spread.
How does Silica Content control Magma Properties? - ANSWERSSilica has a higher melting
temperature, therefore it resists more flow
What are the three types of volcanoes? - ANSWERSComposite, Shield, Dome
How are Composite volcanoes formed? - ANSWERSHigh viscosity has lava cool close to volcano
How are Shield volcanoes formed? - ANSWERSLow Viscosity, long spread
(Volcanoes)
What is the difference Between Magma and Lava? - ANSWERSMagma- Inside the earth's surface
Lava- Outside the earth's surface
How is magma produced in the Mantle? - ANSWERSDecompression Melting, Volatile Fluxing,
Heat Transfer
How does Viscosity control Magma Properties? - ANSWERSIt determines how the lava flows.
The more Viscosity, the less distance the magma can spread.
How do Volatiles control Magma Properties? - ANSWERSIt is the pressure of the magma. The
more Volatiles present, the bigger the pop!
How does Temperature control Magma Properties? - ANSWERSThe more heat, the less viscosity.
The less viscosity, the more distance the magma can spread.
How does Silica Content control Magma Properties? - ANSWERSSilica has a higher melting
temperature, therefore it resists more flow
What are the three types of volcanoes? - ANSWERSComposite, Shield, Dome
How are Composite volcanoes formed? - ANSWERSHigh viscosity has lava cool close to volcano
How are Shield volcanoes formed? - ANSWERSLow Viscosity, long spread