book 3 part 3a

What causes a volcano to erupt?

• Falling stars hitting the mountain
• Cracks filled with cold air
• Gas and melted rock under pressure
• Thunderstorms shaking the ground
• Deep snow blocking the crater

What does magma become once it leaves a volcano?

• Hot steam rising into the sky
• Lava flowing on the ground
• Rocks floating in the air
• Ash mixed with water
• Ice covering the crater

What type of rock is formed when lava cools?

• Crushed sediment
• Twisted crystal
• Pressed sandstone
• Layered marble
• Solid igneous

What was strange about the gas disaster at Lake Nyos?

• The gas came from human mining
• The gas made the volcano explode
• The gas killed people silently
• The gas was released from lava
• The gas changed color before release

What helped scientists see the Hunga Tonga eruption from far away?

• Airplanes flying above the clouds
• Ships circling the volcano
• Underwater scuba cameras
• Orbiting space satellites
• Local helicopter teams

Who is most likely to be harmed during an eruption with no warning?

• Tourists visiting a quiet beach
• People sleeping near a quiet volcano
• Pilots flying over mountains
• Divers exploring sea caves
• Scientists using GPS trackers

What is most likely to happen when ash blocks sunlight?

• Volcanoes grow bigger
• Lava cools faster
• The sky becomes louder
• Crops grow poorly
• Earth’s core heats up

What is most likely to form when lava cools slowly?

• A salt layer
• A shallow crater
• A glassy rock
• A sandy path
• A frozen tunnel

If a volcano were like a bottle of soda, what would magma be?

• The bottle’s plastic
• The label on the side
• The bubbles inside
• The cap on top
• The water near it

Which part of a volcano system is like a sealed container holding pressure?

• The outer rocks
• The ground nearby
• The magma chamber
• The cloud above it
• The lava trails