Volcanic Hazards Flashcards
Which Plate Boundaries are Volcanoes Found at?
Convergent and Divergent.
At Convergent Plate Boundaries, the __________ Plate goes Under the Continental Plate Because it’s More ________.
Oceanic…Dense…
- The Oceanic Plate Moves Down into the _________ where it’s Melted and Destroyed.
- A Pool of _______ Forms.
- The Magma Rises through ________ in the Crust Called Vents.
- Magma ________ onto the Surface Forming a Volcano.
Mantle…Magma…Cracks…Erupts…
At Divergent Boundaries, the Magma _______ Up into the Gap Created by the ________ Moving Apart, Forming a Volcano.
Rises…Plates…
When a Volcano Erupts, it Emits ______ and Gases.
Lava.
Some Volcanoes Emit Lots of _____, which can Cover Land, Block Out the Sun and Form ______________ Flows.
Ash…Pyroclastic…
Hotspots are Found Away from _______ Boundaries.
Plate.
Hotspots Occur where a Plume of Hot ________ from the Mantle Moves Towards the Surface, Causing a Large ______ of Heat from the Mantle to the Crust.
Magma…Flow…
Magma can Break through the _______ and Reach the Surface, when this Happens there is an ___________ and a Volcano Forms.
Crust…Eruption…
Hotspots Remain Stationary Over Time, but the _______ Moves Above Them. This can Create Chains of Volcanic __________.
Crust…Islands…
What are the Different Types of Volcano?
Composite and Shield.
Composite Volcanoes Occur at ______________ Plate Boundaries.
Convergent.
Composite Volcanoes: Subducted Oceanic Crust Contains Lots of ________. The Water Reacts with Magma and Creates _______, which cause the Subducted Crust to _______.
Water…Gases…Erupt…
Composite Volcanoes: They have Explosive ___________ that Start with Ashy Explosions that Deposit a Layer of ______.
Eruptions…Ash…
Composite Volcanoes: They Erupt Andesitic ______ that has a High _________ Content, which Makes it Thick and Sticky.
Lava…Silica…
