Kaboom!

Use the diagram to answer the question below. 
Which idea belongs in the empty box?

• Many volcanoes are located on the Ring of Fire. 
• Scientists go to the site of the volcano. 
• The U.S. volcano program watches volcanoes. 
• Scientists predict when the volcano will erupt.

What causes a volcano to erupt?

• Gas and magma push through the earth's surface. 
• Mudflows and clouds of gas cause damage. 
• The lives of millions of people are put at risk. 
• Dark clouds of dust block the heat from the sun. 

Look at the chart on page 107. Where is Krakatoa located?

• Japan
• Indonesia
• Columbia
• Martinique

In the second paragraph on page 104, the word scale means a -

• device for weighing an object 
• thin, flat, plate-like structure on a snake, lizard, or fish
• series of tones in music 
• series of steps or degrees showing relative size

The author wrote this article most likely to- 

• persuade the reader to visit a volcano
• show the reader what volcanoes look like
• explain the new ways to tell when a volcano will erupt
• share an opinion about why volcanoes are beautiful 

Which sentence from the selection best supports the idea that volcanoes are a threat- 

• Scientists can get to to an active volcano within 48 hours of the first sign of trouble.
• They can do their work and keep safe.
• The satellite finds the location of each sensor.
• They put the lives of 500 million people at risk.

The section titled “Keeping Out of Harm’s Way” is mainly about -

• how volcanologist and scientists can gather data and information while staying safe.
• how researchers have found new ways to watch volcanoes from satellites.
• how a volcano erupts when gas and magma push through the earth’s surface.
• how many of the world’s volcanoes are lined up along the Ring of Fire.

Which text feature in the article helps the reader understand where the most of the volcanoes and earthquakes are located? 

• The table on page 107
• The title “Kaboom!  Volcanoes are a Threat”
• The map on page 106
• The caption next to the volcano photograph

The author included paragraph 9 most likely to-

• persuade the reader to learn more about volcanoes.
• inform the reader how scientists can predict volcano eruptions.
• explain how volcanologists stay safe when gathering data.
• give information about the types of tools that volcanologists use.

Which sentence best explains how Volcanologists can predict when a volcano may erupt?

• Still, these scientist keep studying ways to predict eruptions.
• Scientist can get to an active volcano within 48 hours of the first sign of trouble.
• These sensors feel rumbles as magma and gases move inside the volcano.
• The good news is that scientist can now help keep people safe.