TEST I - VOLCANO

What is a Volcano?

• A. A cone-shaped mountain formed by erupting lava, ash and gases.

• B. A landform which has a summit but without a crater.

• C. A mountain created by the faulting and folding of earth’s crust.

• D. The movement of the Earth’s crust when plate boundaries move.

What is meant by volcanic eruption? 

• It happens when hot lava, ash and gases are discharged from a volcanic vent.

• It happens when the plate edges of the Earth’s crust move downward or sideways.

• It is a region deep within the Earth’s mantle from which heat rises.

•    It is a sudden violent shaking of the ground, causing great destruction.

Which of the following volcano hazards is made up of rocky particles about the size of a grain of sand?

• Volcanic bombs

• Volcanic dust

• Volcanic ash

• Pyroclastic

Mt. Mayon is an example of a volcano because . 

•   Cinder cone, it is formed exclusively of pyroclasts.

• Composite, it is composed of alternating layers of pyroclastic fragments and solidified lava flows

• Shield, it is constructed of solidified lava flow

• Caldera, it was created when the summit was blown off by exploding gases

Eruptions caused by the interaction of water into heated magma is called:

•   Vulcanian

• Plinian

• Phreatic

• Strombolian

  6. Mount Pinatubo erupted last April 2, 1991. What kind of volcanic eruption was Mt. Pinatubo? 

• Vulcanian

• Phreatomagmatic

• Strombolian

• Plinian

   Before the lava reaches the surface' the molten material is called _________.

• Rock

• Magma

• Volcanic Ash

• Pyroclastic

A Lahar is a mudflow produced when a volcano's heat melts the snow and ice and it mixes with the ash and debris from the volcano.

• TRUE

• FALSE

   These are the largest rock particles released from a volcano.

• Volcanic dust

• Volcanic ash

• Pyroclastic

• Volcanic bombs

During a volcanic eruption, stay indoors and

• stock food and water in covered containers

• cover your nose with damp cloth

• remove ash deposits on roofs