ASSESSMENT - Volcanic Eruption

An explosive eruption occurs if magma is _______.

 

• low in viscosity

• high in silica. 

• very thin

• very gaseous

How well a liquid flows depends on its ________.

• malleability

• permeability

• viscosity

• temperature

 Of the following, the magma with the highest viscosity would have:

• a high silica content and high temperature

• a high silica content and low temperature

• a low silica content and high temperature

• a low silica content and low temperature

Which type of volcanic eruption is most explosive?

• Strombolian Eruption

• Vulcanian Eruption

• Plinian Eruption

• Hawaiian Eruption

The eruption of Taal Volcano last January of 2020 exhibited this type of volcanic eruption.

• Phreatic Eruption

• Phreatomagmatic Eruption

• Vulcanian Eruption

• Plinian Eruption

What provides the force that causes magma to erupt to the surface?

• the gravity in the lithosphere

• the silica in the magma

• the density of the magma

• the dissolved gases trapped in the magma

Which type of lava flows easily?

• silica-rich

• basaltic

• composite

• smooth

The term viscosity refers to:

• how heat and pressure influence a liquid’s gas content.

• a liquid’s resistance to flow.

• how dense a liquid is.

• how a liquid moves upward against gravity.

Compared to andesitic lavas, basaltic lavas tend to be:

• higher in viscosity and they retain dissolved gases.

• higher in viscosity but they easily release dissolved gases.

• lower in viscosity and they retain dissolved gases.

• lower in viscosity and they easily release dissolved gases.

Which type of volcanic eruption is the least explosive?

• Strombolian Eruption

• Vulcanian Eruption

• Plinian Eruption

• Hawaiian Eruption