VOLCANIC ERUPTION-SCIENCE 9

1. What is the primary substance that comes out of a volcano during an eruption?

• • A. Water

• • B. Magma

• • C. Sand

• • D. Oil

1. What can volcanic eruptions release into the atmosphere that affects air quality?

• A. Oxygen

• B. Helium

• C. Ash

• D. Nitrogen

1. Which factor does NOT influence the type of volcanic eruption?

• A. Wind speed

• B. Volcanic gases

• C. Magma composition

• D. Crust composition

1. Which classification of volcano is considered most dangerous due to its unpredictability?

• • A. Active

• • B. Dormant

• • C. Extinct

• D. Potentially Active

1. What is the primary characteristic of an extinct volcano?

• • A. It erupts frequently

• • B. It shows no signs of future eruptions

• • D. It erupts every few years

• D. It has not erupted in the previous years but can possibly erupt again.

1. How do scientists categorize a dormant volcano?

• • A. It erupts daily

• • B. It has not erupted for a long time but may erupt again

• • C. It will never erupt again

• D. It has not erupted since the last ice age.

1. What is one key reason why monitoring active volcanoes is important?

• • A. To observe a fascinating event

• B. To protect the shape of a volcano and its form

• • C. To measure the amount of lava flow

• D. To predict potential eruptions and protect lives

What type of eruption occurs when water is heated by magma and creates steam explosions?

• A. Phreatic

• B. Magmatic

• C. Phreatomagmatic

• D. Hawaiian

1. Which type of volcanic eruption is typically the least explosive?

• • A. Phreatic

• • B. Magmatic

• • C. Phreatomagmatic

• D. Plinian

1. Which type of eruption results from water coming into contact with hot magma?

• • A. Phreatic

• B. Magmatic

• C. Phreatomagmatic

• D. Plinian