Third Quarterly Examination in Science 9

It is the slightly doomed structure that resembles a warrior’s shield?

• Cinder cone

•  Shield volcano      

• Composite volcano

• Strombolian

Also known as STRATOVOLCANO. This is large nearly perfect sloped structure formed from the alternate solidification of both lava and pyroclastic deposits

• Shield volcano

• Cinder cone

• Composite volcano

• Vulcanian

Mayon is an example of a ______ volcano because_____. 

• Cinder cone, it is formed exclusively of pyroclastic materia

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

• Shield, it is constructed of solidified lava flow was created when the summit has blown off by exploding gases

Which of these is TRUE for a Phreatomagmatic eruption?

• It is a silent eruption due to oozing lava

• Its eruption is characterized by fountain lava

• Its eruption has resulted to sideway emission of pyroclastic

• It is short- lived eruption and maybe an onset of a major eruption

What is the basis of classifying volcanoes as active or in active?

• Materials they emit

• Place where they are located

• Age of the volcanoes    

• Historical record of eruption or volcanic eruption

Volcanoes are basically divided into how many types? 

• 3

• 4

• 5

• 2

What is Volcano?

• The movement of the plate boundaries on the Earth’s crust.

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

• An opening in the Earth’s crust through which lava, ash, and gases escape onto the surface

• A land form which has a summit but without a crater.

1.      Which statement is INCORRECT?

• Volcanoes give information about inner Earth.

• Volcanoes can be found on land and ocean floor.

• Volcanoes show precursory signs before eruption.

• Volcanoes that do not produce lava is not dangerous.

Which type of volcanic eruption is very explosive?

• Phreatic

• Strombolian

• Plinian

• Phreatomagmatic

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

• Plinian

• Phreatic

• Strombolian

• Vulcanian