Moving magma around Flashcards
Why does magma rise through the Earth’s crust?
It is less dense than the surrounding rock
What is an intrusion?
Magma that cools and solidifies below the surface
Which factor does NOT influence the explosiveness of a volcanic eruption?
Lava color
What type of volcanic eruption is typically quiescent and produces fluid basaltic lava?
Hawaiian
What are cinder cone volcanoes primarily built from?
Ejected cinders and lava fragments
What is a composite cone (stratovolcano) made of?
Interbedded lava and pyroclastic layers
What is a caldera?
A large depression formed after a major eruption and collapse
What is a pyroclastic flow?
A fast, hot avalanche of gas, ash, and rock
What causes a lava dome to potentially trigger a larger eruption?
Its collapse reduces pressure on gas-rich magma
What controls the location of most volcanoes?
Plate tectonic settings
