VOLCANO BASICS
These volcanoes have erupted in the last century, so they are classified as
What is active
Most volcanoes form near these tectonic areas
What is plate boundaries or the Ring of Fire
Magma that reaches Earth's surface
What is lava
The opening where magma flows out of the volcano
What is a vent
This volcano has steep sides made from moderately explosive eruptions and layers of ash and cinders.
What is cinder-cone
A volcano that has not erupted in the last century
What is dormant
Unusually hot areas in the mantle where magma punches through the crust and rises to the surface
What are hot spots
This mineral affects the thickness of magma
What is silica
A bowl-shaped depression that forms around the vent of a volcano
What is a crater
Mt. St. Helens in Washington erupted violently in 1980 is classified as this type of volcano
What is composite
Molten rock beneath the Earth's surface
What is magma
Volcanoes that form where the Earth's plates move apart
What is divergent boundaries
This determines whether an eruption is quiet or explosive
What is the composition of the magma
A large, deep depression caused by the collapse of the top of the volcano
What is a caldera
Mauna Loa in Hawaii is this type of volcano with quiet eruptions and gently sloping sides
What is a shield volcano
the study of all the processes associated with the discharge of magma & gases
What is volcanism or volcanology
Volcanoes form here where the Earth's plates come together
What are convergent boundaries
Basaltic magma produces this type of eruption
What is a quiet eruption
mixture of volcanic ash, and water similar to a mudflow
What is a Lahar
The most active volcano in the world
What is Kilauea
A substance's internal resistance to flow
What is viscosity
This zone is formed when oceanic crust slides under a continent
What is subduction zone
Rhyolitic magma produces this type of eruption
What is an explosive eruption
Rapidly moving clouds of ash, and rocks mixed with hot, suffocating gases
What are pyroclastic flows
These volcanoes can have both quiet & explosive eruptions and steep sides.
What is a composite volcano