Volcanoes (4) Flashcards
A weak spot in the Earth’s crust where magma comes to the surface
volcano
Major volcanic belt formed by the many volcanoes in the rim of the Pacific Ocean
Ring of Fire
area where material from deep within the mantle rises then melts, forming magma
Hot spot
mixture of hot gases, ash, cinders and bombs hurled out from an explosive eruption
Pyroclastic flow
“Sleeping” volcano, can become active again in the future
Dormant volcano
volcano that is unlikely to erupt again
Extinct volcano
A bowl shaped area that forms around a volcano central opening
Crater
magma that reaches the earth’s surface
Lava
A molten mixture of rock forming substances, gases, and water from the mantle beneath the earth’s surface
magma
A pocket in the volcano where magma collects (towards the bottom of the volcano)
Magma chamber
Area covered by lava as it pours out of a vent
Lava flow
String of islands created by volcanoes near boundaries where 2 oceanic plates collide and one side sinks beneath the other
Island Arc.
What does the volcano system include?
Magma chamber, pipe, vent, crater, and lava flows
Low silica content
flows easily and erupts quietly
gases bubbling out gently and lava oozes out
Characteristics of a quiet eruption
High silica content
flows easily and erupts loudly
gases bubbling until exploding
Characteristics of a explosive eruption
