Volcanoes Flashcards
(26 cards)
What kind of Volcano has a gentle slope, Hawaiian islands, and very runny lava?
Shield
What are the 4 types of volcanoes?
Cinder cone, shield, lava dome, and strato volcano
What does viscosity mean?
The resistance to flow
What kind of volcano is made of small rock fragments that fall around the vent! and are short?
Cinder cones
What is pyroclastic flow?
A flow that is extremely fast, has a lot of gas, tephra, and is very dangerous
What is a supervolcano?
A volcano that produces and ejects more than 1000 km cubed of tephra
What is a caldera?
A dried crater
Which kind of volcano has very thick, viscous lava that can seal the vent?
A lava dome
What does viscosity mean?
The resistance to flow
What is a lahar?
A mudflow that comes from a volcanic eruption
What is aa lava flow?
Rough and jagged blocks
What are the 3 super volcanoes on earth?
Yellowstone, Long valley, and valley caldera
Pumice
Very light
Basalt
Dark fine-grained volcanic rock
Obsidian
Naturally occurring volcanic glass, extrusive
What is a hotspot?
A small area with a hot temperature
Series of island with hotspot?
Hawaiian Islands
Andestic rocks
They have properties of both mafic and felsic rocks
Define subduction
Subduction is when one plate dips beneath another
What is molten rock also known as?
Magma
Which layer of the surface is the thickest?
The mantle
What are four things that can be ejected from a volcano?
Hot magma, rock, ash , and gases
How does lava silicate content affect viscosity?
The higher the silica, the higher the viscosity
Gases effect explotivity?
The more the gas, the higher the chance of greater explotivity
