Volcanoes 1
Magma that is thick and sticky and flows slowly has what type of viscosity?
A volcano that has not erupted in recorded history and probably never will erupt again
What is extinct?
Large volcanoes with gentle slopes. Low and wide volcanoes with effusive eruptions are known as this.
What is a shield volcano?
Volcanically active area of earth’s surface far from a tectonic plate boundary. Hawaii's chain of islands is a great example
What is a hotspot
As you move further away from the hotspot, the volcanic islands are described as this type of age
What is older age
Most volcanoes are located here
What is the ring of fire
A volcano that is currently erupting or shows signs of erupting in the near future.
What is active?
Tall volcanoes that form from explosive and non explosive eruptions which means it has alternating layers. Made of felsic to intermediate rock, these very tall volcanoes have fairly viscous lava and often explosive eruptions.
What are composite/stratovolcano volcanos?
Molten rock above earth's surface
What two things causes rock to melt, forming magma?
What are high temperatures and low pressures
Pyroclastic material like hot debris, ash, and rock is released from this type of eruption
What is explosive eruption
A volcano that is currently not erupting, but the record of past eruptions suggests that they may erupt again
What is dormant or inactive
A large, semicircular depression that forms when the magma chamber below a volcano partially empties, the chamber roof collapses, and causes the ground above to sink
What is a caldera?
Molten rock below earth's surface
What is magma
A liquid’s resistance to flow is known as this.
What is viscosity?
A calm lava flow is from this type of eruption
What is a non explosive eruption?
This term is described as areas (vents/cracks or fissures) of earth's surface through which magma and volcanic gases pass
What is a volcano
Funnel-shaped pit near the top of the central vent of a volcano. They get larger and deeper
What is a crater
A body of molten rock deep underground that feeds a volcano
What is a magma chamber?
The 4 things that increase the chances that a volcano will have an explosive eruption
What is an increase in water, silica, carbon dioxide, and viscosity
Wide, flat landform that results from a repeated non explosive eruptions of lava that spread over a large area
What is a lava plateau
Volcanoes are common along these two plate boundaries
What are convergent and divergent plate boundaries?