How does viscosity affect the explosiveness of lava?
High Viscosity = High explosiveness
Low Viscosity = Low explosiveness
100
What is the most common gas in lava?
Water vapor
100
Name one factor of granitic lava.
Possible Choices:
Thick
Lumpy
Sticky
Erupts Explosively
Flows slowly
Low Heat
High Silica
High Viscosity
100
Who does temperature affect the viscosity of lava?
Hotter temperatures = Less vicious
100
What causes magma to rise to the surface: high pressure or low pressure?
High pressure.
200
How is viscosity measured?
Viscosity is measured by the way an object moves or flows.
200
What is released into the atmosphere after volcanic eruptions?
dissolved gases.
200
How does Aa lava cool?
Aa lava cools in rough, jagged blocks.
200
Which has a lower temperature: basaltic lava or ryolitic lava?
Ryolitic lava has a lower temperature.
200
How is the melting of minerals similar to the melting of rocks?
melting temperatures increase with increasing pressure.
300
Low silica amount =
Low viscosity
300
What is the second most common gas in lava?
Carbon Dioxide
300
Pahoehoe lava has .....
(Describe the type of viscosity)
low viscosity.
300
What is one piece of evidence that determines the temperature of lava/magma?
Possible answers: Direct measurements of flowing lava
The melting or inversion temperatures of minerals crystallized from a magma.
The melting temperatures of mineral mixture.
300
What is the level of gas content of Basaltic lava.
Low.
400
The viscosity of an object depends on...
the temperature and composition of the object.
400
What is one of the factors that affects magma's density and what are the two main gases within the factor?*
*Must restate
The main factor is gases within the magma, and the two main gases within are carbon dioxide and water vapor.
400
What are both Pahoehoe lava and Aa lava composed of?
Basalt
400
What is the scale of the degree of partial melting?
0 to 100%
400
What is the term for if the mineral contains no water (H2O) or carbon dioxide (CO2) and there is no water or carbon dioxide present in the surroundings, then melting occurs at a single temperature at any given pressure and increases with increasing pressure or depth in the Earth?
dry melting.
500
Low viscosity lava does not carry...
air bubbles.
500
What happens if there is no carbon dioxide or hydrogen within the mineral or the surroundings of the mineral?
melting occurs at a single temperature at any given pressure and gets higher through increasing temperature.
500
What are the slowest types of flowing lava?
Dacite and ryolite lava are slowest flowing.
500
What is the highest temperature of magma? Lowest?
The highest temperature is 1300 degrees Celsius and the lowest is 600 degrees Celsius.