15 Questions
What is the temperature of lava on average?
2000 degrees Fahrenheit
What is the main cause of the explosive nature of lava?
Gases present in the magma
Why does lava take several days to years to cool down completely?
The presence of dissolved gas
What forms when lava cools down after flowing from a volcano?
Rock
What are the two major components that make up lava composition?
Oxygen and Silicon
Which of the following statements about mafic lava is true?
It has a low silica content and low viscosity.
What is the primary factor that determines the morphology (form and texture) of a lava flow?
All of the above
Which of the following is NOT a characteristic of felsic lava?
It erupts at high temperatures.
What is the primary difference between pahoehoe and aa lava flows?
Pahoehoe flows have a smooth surface, while aa flows have a rough surface.
Which type of lava flow is associated with low-effusion eruptions?
Pahoehoe lava flow
What is the defining characteristic of pahoehoe lava flows?
They have multiple thin flowing units and low viscosity.
What is the origin of the term 'aa' used to describe a type of lava flow?
It is derived from the sound a person makes when walking on the rough surface.
Which characteristic distinguishes aa lava flows from pahoehoe lava flows?
All of the above.
What is the defining characteristic of blocky lava flows?
They have the roughest surface compared to other lava flow types.
How do pillow lavas form?
They form when lava erupts underwater and the surface skin cools quickly.
Learn about the characteristics of lava flow, including its high temperature, viscosity, and the process of cooling to form rocks after eruption from a volcano.
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