Q3-Science 9 Reviewer

What kind of volcano according to structure does the picture below represent?

• cinder cone

• composite

• shield

• hawaiian

Which statement BEST describes an extinct volcano?

• Volcanoes no longer produce eruptions but might again sometime in the future.

• Volcano has had at least one eruption during the past 10,000 years.

• Volcano has not had an eruption for at least 10,000 years and is not expected to erupt again in a comparable time scale in the future.

• Volcano that is not erupting but is supposed to erupt again.

Two volcanoes are being monitored in a study: Mount Rainier and Mount St. Helens. Mount Rainier has had no signs of volcanic activity for the past 10,000 years and there are signs of changes due to weathering throughout its slopes. On the other hand, Mount St. Helens has been showing no signs of volcanic eruption for the past decades, yet scientists expect it to show activity soon based on recent seismic readings and gas emissions. What types of volcanoes are Mount Rainier and Mount St. Helens?

• Mount Rainier is active while Mount St. Helens is dormant.

• Mount Rainier is inactive while Mount St. Helens is active.

• Mount Rainier is inactive while Mount St. Helens is dormant.

• Mount Rainier is dormant while Mount St. Helens is inactive.

Volcanic eruptions are classified based on their characteristics and intensity. Which of the following statements CORRECTLY describe types of volcanic eruptions?
I. Phreatomagmatic – violent eruption due to contact between magma and water.

II. Hydrothermal – a periodic weak to violent eruption characterized by fountain lava.

III. Plinian – an excessively explosive type of eruption of gas and pyroclastic.

• I and II

• I and III

• II and III

• I, II, and III

Based on the table above, which of these statements accurately compares the three magma compositions?
I. Rhyolitic magma has the highest gas content, highest silica content, and the most viscous magma composition.

II. Andesitic magma has greater silica and gas content than basaltic magma but less than the silica and gas content of rhyolitic magma.

III. Basaltic magma has the lowest gas content, but the highest silica content and the least viscous magma composition.

• I and II

• II and III

• I and III

• I, II, and III

It is a violent eruption due to the contact between water and magma.

• Phreatic eruption

• Phreatomagmatic eruption

• Hawaiian eruption

• Vulcanian eruption

Which precautionary measure is to be taken when you are living near an active volcano?

• Wear light-colored clothes.

• Wear protective boots and gloves.

• Know your evacuation route.

• Stay clear of hot lava, flying rocks, and debris.

What is the fundamental driving force behind these eruptions?

• Sudden cooling of the Earth's core.

• The impact of a large meteorite.

• The buildup of pressure from magma within the Earth.

• Strong winds and storms.

Which is/are TRUE about the things to do related to volcanic eruption?

I. Before a volcanic eruption, prepare emergency kits.

II. During a volcanic eruption, remove ash accumulated on rooftops.

III. Be updated about volcanic advisories before, during, and after volcanic

eruptions.

• I

• I and II

• I and III

• I, II and III

In which location on the map below is LEAST likely to experience volcanic activity or earthquakes?

• A

• B

• C

• D