Volcanoes (Grade 10 NSC Matric Geography): Flashcards
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Practise the cards
10 cards from this deck
Vent (volcano)
Vent (volcano)
Main pathway connecting underground magma to Earth's surface
Magma chamber
Magma chamber
Underground reservoir where molten rock collects before eruption
Crater (volcano)
Crater (volcano)
Bowl-shaped depression at volcano's summit; surface opening
Volcanic cone
Volcanic cone
Mountain-like structure built from layers of lava, ash & materials
Side vents
Side vents
Form along slopes when magma finds alternative pathways to surface
Secondary cones
Secondary cones
Smaller volcanic structures on main volcano's flanks
Caldera
Caldera
Large crater formed when volcanic cone collapses into empty chamber
Caldera formation cause
Caldera formation cause
Massive eruption empties magma chamber; cone collapses inward
Crater Lake, Oregon
Crater Lake, Oregon
Caldera formed ~7,700 yrs ago from Mount Mazama eruption collapse
Wizard Island
Wizard Island
New volcanic cone within Crater Lake, formed after original collapse