volcano

Which of the following BEST describes a volcano?

• It is a place within the mantle where rocks melt to generate magma.

• It is a long tube in the ground that connects the magma chamber to Earth’s

  surface.

• It is an opening in the Earth's mantle through which lava, volcanic ash,

  and gases escape.

• It is an opening on the surface of the Earth that allows material warmer

  than its surroundings to escape from its interior.

Which type of volcano is shown in the diagram?

• cinder cone

• composite volcano

• shield volcano

• underwater volcano

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

• size of the base

• shape of the cone

• age of the volcano

• records of eruption

Magma with a high silica content tends to be:

    

• very hot

      

• very smelly

      

• very viscous

• very runny

Volcanic eruptions can affect climate because:

 

• they heat the atmosphere.

• volcanic dust and gas in the upper atmosphere reflects and absorbs solar radiation

• volcanoes have no effect on Earth's climate.

• none of the abpve

Magma rises to the surface because it is less dense than

solid rock.

• TRUE

• FALSE

Which kind or kinds of eruptions has this volcano had?

• quiet eruptions

• explosive eruptions

• both quiet eruptions and explosive eruptions

Which of these is NOT a sign of impending volcanic eruption?

• Crater glow due to presence of magma at or near the crater.

• Decrease in the temperature of hot springs, wells, or crater lake near the

  volcano

• Increase in the frequency of volcanic quakes with rumbling sounds;

  occurrence of volcanic tremors

• Increase steaming activity; change in color of steam emission from white to

  gray due to entrained ash.

Which of the following is a sign of an impending volcanic eruption?

• Volcanic tremors

• Increase level of water

• Presence of hot spring

• Occurrence of thunderstorm

The eruption of Mount Pinatubo in the Philippines on June 15, 1991, was the

second largest of the 20th century. Its eruption was characterized as an

excessively explosive type of eruption of gas and pyroclastic. Which type of the

eruption is this?

• Phreatic

• Phreatomagmatic

• Plinian

• Strombolian