WorksheetsFormation of Volcanoes
Total questions: 12
Worksheet time: 12mins
Which of the following most completely defines a volcano?
a cone-shaped structure on land where pyroclastic material is ejected
a partly molten region of Earth's mantle where subducting rock is melted
a ridge system between two diverging plates through which magma escapes
a vent or hole in Earth's surface through which melted rock or ash erupt
_____ is the thickness of a liquid or its resistance to flow.
Felsic
Mafic
Liquefaction
Viscosity
When magma has a high viscosity, how is it most likely to erupt?
quietly
explosively
constantly
most likely will not erupt
Due to it's lower viscosity, which magma type would be the least explosive?
Felsic
Mafic
Ultrafelsic
Ultramafic
Volcanoes are found along:
convergent plate boundaries.
divergent plate boundaries.
Both A and B
None of the above
Volcanoes can form at divergent boundaries when which of the following occurs?
Plates move toward each other causing the more dense plate to sink and melt, which allows for magma to rise back to the surface.
Plates move apart from each other allowing for less dense magma to rise up through the fissure.
Plates move over top a magma plume creating a line of volcanic mountains.
Plates move side by side, heating the rock and melting it.
Volcanoes can form at convergent boundaries when which of the following occurs?
Plates move toward each other causing the more dense plate to sink and melt, which allows for magma to rise back to the surface.
Plates move apart from each other allowing for less dense magma to rise up through the fissure.
Plates move over top a magma plume creating a line of volcanic mountains.
Plates move side by side, heating the rock and melting it.
Which kind of volcanism is most likely to occur at location A in the following map?
Location A is a hot spot in oceanic crust, so it is likely to erupt lava with a low silica content, resulting in relatively quiet volcanism.
Location A is a hot spot in oceanic crust, so it is likely to erupt lava with a high silica content, resulting in explosive volcanism.
Location A is a mid-ocean ridge at a divergent boundary, so it is likely to erupt lava with a low silica content, resulting in relatively quiet volcanism.
Location A is a mid-ocean ridge at a divergent boundary, so it is likely to erupt lava with a high silica content, resulting in explosive volcanism.
A geologist notes that melted rock is escaping from Earth's interior at location A and identifies location A as a volcano. A student objects that location A is too far from any plate boundaries to be a volcano.
Is the student's objection correct? Why?
Yes; location A is too far from any plate boundaries to be a volcano.
No; although volcanoes can be located far from plate boundaries, volcanoes erupt lava and ash, not melted rock.
No; although many volcanoes are located at plate boundaries, volcanoes are also located far from plate boundaries at hot spots.
No; although volcanoes are located at plate boundaries only, location A is close enough to the boundary between the North American and Pacific plates to be a volcano.
What process causes the volcanoes of the Hawaiian Islands to form?
subduction zones
hotspots
convergent boundaries
divergent boundaries
When two oceanic plates converge, it produces which type of volcanoes?
Continental arc volcanoes
Hotspot volcanoes
Island arc volcanoes
Mid-ocean ridge volcanoes
How long can the finest ash particles from a volcanic eruption remain in the atmosphere?
between hours and days
between days and weeks
between weeks and months
between months and years
