VOLCANOES

TRUE OR FALSE: The higher the temperature of magma is, the higher is its viscosity.

• TRUE

• FALSE

TRUE OR FALSE: Viscosity is the property of the material’s resistance to flow.

• TRUE

• FALSE

TRUE OR FALSE: The more viscous and thicker the material is, the less its resistance to flow.

• TRUE

• FALSE

TRUE OR FALSE: As lava flows, it cools and begin to harden thus, its ability to flow increases and eventually it stops.

• TRUE

• FALSE

TRUE OR FALSE: Lava with low amount of gas and high silica content is very viscous and does not flow out as it rises.

• TRUE

• FALSE

Which of the following characteristics of a volcano depends on its magma emission?

• age

• shape

• size

• location

Which of the following is TRUE to volcanoes with high amounts of dissolved gas and high amounts of silica?

• They are extremely explosive.

• They are sometimes explosive and sometimes more gentle.

• They are more gentle with flowing lava.

• They are unpredictable, with any kind of eruption.

It is a periodic weak to violent eruption characterized by fountain lava.

• Strombolian

• Phreatomagmatic

• Plinian

• Vulcanian

It is a violet eruption due to the contact between water and magma.

• Strombolian

• Phreatomagmatic

• Phreatic

• Plinian

It is characterized by tall eruption columns that reach up to 20 km high with pyroclastic flow and ash fall tephra.

• Plinian

• Phreatic

• Strombolian

• Vulcanian