Types of Magma/Tephra
Describe basaltic magma
thin/runny/watery magma, low silica content. Not very explosive
Higher gas content in the magma makes it more or less explosive?
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As depth increases, what happens to pressure
it increases
What is silica?
a mineral that makes magma thicker
Describe andesitic magma
medium thickness/medium explosiveness, medium silica content
More silica content makes the volcano more or less explosive?
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More water vapor in the magma makes rocks do what more easily?
melt
What is viscosity?
How thick something is/how resistant to flow it is
Describe rhyolitic magma
high thickness, highly explosive, high silica content
More viscous magma makes the explosion more or less violent?
More violent
As pressure increases, what needs to happen to temperature to make a rock melt?
It needs to increase
What is pyroclastic flow?
a cloud of suffocating gases and tephra
What is the smallest type of tephra?
ash
What is igneous rock?
Rock that is made from cooled lava/magma
What is the largest tephra?
blocks