GEL CHp. 5 volcanos

What is the definition of viscosity

• Two plates sliding past each other

• Rocks that are composed primarily of silicate minerals

• The resistance to flow

• An edifice created by erupting magma

Select the correct statement

• High viscosity magma contains high silica content and is felsic- granitic

• High viscosity contains low silica content and is mafic- basaltic

• High viscosity contains high silica content and is mafic- basaltic

• High viscosity magma contains low silica content and is felsic- granitic

Which statement is true

• Low viscosity magma contains high iron and magnesium felsic - basaltic

• Low viscosity magma contains low iron and magnesium mafic - basaltic

• Low viscosity magma contains high iron and magnesium mafic - granitic

• Low viscosity magma contains high iron and magnesium mafic - basaltic

What’s the difference between AA and Pahoehoe lava

• Pahoehoe lava is jagged, sharp and a blocky texture while AA is shiny like aluminum, smooth and, ropey texture

• AA lava is jagged, sharp and a blocky texture while Pahoehoe is shiny like aluminum, smooth and, ropey texture

• There is no difference there both the same

• AA is smooth, shiny, yet jagged and ropey while Pahoehoe is sharp, blocky and dull

Factors which control viscosity and the type of volcanic eruptions

• Composition of magma

• Temperature of magma

• Amount of volatiles

• All of the above

Temperature of magma

• The more volatiles the more violent

• The more silica the more violent

• None of these

• The lower the temperature the more violent

Composition of magma

• The lower the temperature the more violent

• The more silica the more violent

• The more volatiles the more violent

• None of these

Amount of volatiles

• The lower the temperature the more violent

• The more volatiles the more violent

• The more silica the more violent

• None of these

Where do most volcanoes occur

• The ring of fire

• Near the Atlantic Ocean

• Subduction zone

• In Japan

___ are convergent boundaries where at least one of the tectonic plates is an oceanic crust