Quiz #1

Where do most volcanoes form?

• At tectonic plate boundaries and hotspots.
• At the tops of mountains
• Underneath oceans only
• In the center of continents

When is it considered as explosive volcanic eruption?

• An eruption is considered explosive when it happens quietly without any sound.
• An eruption is considered explosive when it involves violent expulsion of materials.
• An eruption is considered explosive when it produces minimal ash and gas.
• An eruption is considered explosive when it occurs underwater.

Another method of determining the activity of a volcano is through

• carbon levels

• existence of lake

• historical timeline

• sulfur level

Volcanic belts form along ____

• mountain ranges
• oceanic ridges
• tectonic plate boundaries
• river deltas

3.    Taal Volcano, cone-shaped mountains in which layers of lava alternate with layers of ash. How is Taal Volcano classified according to the shape of its cone?

• Shield volcano
• Cinder cone volcano
• Lava dome volcano
• Stratovolcano

3.    What is the basis for classifying volcanoes as active or inactive?

• age of the volcano

• records of volcanic eruption

• size of the base

• shape of the cone

   Several kilometers from a volcano, a geologist observes an old lava flow made up of dark-colored basalt rock. Which of the following geologists infers that the lava might have?

• high silica content

• high viscosity

• low viscosity

• lava plateau

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 gas and pyroclastic eruption. What type of eruption is this?

• Fissure eruption
• Strombolian eruption
• Plinian eruption
• Hawaiian eruption

  Martha bought syrup for her pancake. She compared the stickiness of the syrup to lava flowing to the surface after a volcanic eruption. What do you call the stickiness and thickness of the syrup?

• viscosity
• density
• fluidity
• adhesiveness

   The news reporter said, "There is a volcanic eruption near Barangay San Luis.” What is the molten material or rocks inside the Earth that have been ejected out of a volcanic eruption?

• Magma
• Ash
• Pumice
• Lava