G9-SCIENCE_SEATWORK#2-Q3

The calmest of the eruption types.

• Hawaiian

• Strombolian

• Vulcanian

• Surtseyan

A volcanic eruption can be either _____.

• explosive or gentle

• explosive or violent

• explosive or smooth

• explosive or a geyser

Eruptions driven by bursting gas bubbles within the magma.

• Hawaiian

• Strombolian

• Vulcanian

• Surtseyan

It is an explosive eruption that occurs when the pressure of entrapped gases in a relatively viscous magma becomes sufficient to blow off the overlying crust of solidified lava

• Hawaiian

• Strombolian

• Vulcanian

• Surtseyan

Considered the most explosive and powerful of all eruptions.

• Hawaiian

• Strombolian

• Vulcanian

• Plinian

Magma becomes lava when it reaches a volcano's ______.

• Vent

• Crater

• Chamber

• Mantle

Which of the following describes a strombolian eruption?

• a periodic weak to violent eruption characterized by fountain lava

• excessively explosive type of eruption of gas and pyroclastics

• characterized by tall eruption columns that reach up to 20 km high with pyroclastic flow and ashfall

• all of the above

What type of eruption is characterized by excessively explosive type of eruption of gas and pyroclastics?

• Vulcanian

• strombolian

• Plinian

• Phreatomagmatic

Which of the following statements listed below is NOT a positive aspect of volcanic eruption?

• The dramatic scenery of volcanic eruption attacts tourists.

• lava flows and lahars clear areas of woodland, agriculture and destroy settlements

• The lava and ash deposited during a volcanic eruption breaks down to provide valuable nutrients for the soil

• all of the above

TRUE OR FALSE:  A substance that flows quickly has high viscosity...

• True
• False