Volcano and Plate Tectonics
A weak spot in the crust where molten material comes to the surface.
What is a volcano?
Liquid magma rises upward through the cracks because of this.
What is magma is less dense than the surrounding liquid?
Volcanoes that are tall, cone-shaped mountains and have alternating lava flows and explosive eruptions of ash, cinders, and bombs.
What is composite volcanoes?
What lava is called before it reaches the surface.
What is magma?
The process that creates island arcs.
What is subduction?
Cooler, slow-moving lava made from quiet eruptions.
What is pahoehoe?
Magma that forces itself across rock layers.
What is a dike?
An area where magma from deep within the mantle melts through the crust above it.
What is hot spot?
The main factor that makes a difference between a quiet eruption and an explosive eruption.
What is silica content? If the magma is high in silica, it is thick and sticky, making it get stuck and explode suddenly.
Landform that forms when rising magma, blocked by layers of rock, forcing rock to bend upward.
What is a dome mountain?
The two plates that create island arcs.
What are two oceanic plates?
Occurs when an explosive eruption hurls out ash, cinders, and bombs.
What is a pyroclastic flow?
Large mass of rock formed when a large body of magma cools inside the crust.
What is batholith?
How do volcanoes form at divergent boundaries?
What is two plates move apart and lava pours out of the cracks on the ocean floor?
What kind of magma and eruption is likely to occur in a volcano having magma high in silica?
What is thick and sticky magma and explosive eruption?
The part of the volcano that hardens and wears away to make the volcanic neck.
What is the pipe?