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When a volcano is "active" it can ____________.
erupt
Joanna Green is studying a volcano in __________.
Hawaii
The layer of rock below the Earth's crust is called the _________.
mantle
Lava is made from hot liquid _________.
rock
Something that is _____________ is not safe.
dangerous
To _____________ means to break open or shoot out suddenly.
erupt
A ________________ is a sign that something bad can happen.
warning
The outside part of something is called the ___________.
surface
Volcanoes are one of the ______________ on Earth that we live with but cannot control.
forces
True or False: 20 years after Mount St. Helens erupted, everything around the volcano is still dead.
False: Trees have grown back and animals live in the forests again.
A volcano called Mount St. Helens erupted in the year ____________.
1980
True or False: Humans always know when a volcano is going to erupt.
False: Many volcanoes can erupt without warning!
Some people ___________ the land near volcanoes because the soil is good for growing crops.
farm
True or False: Many people live near volcanoes.
True.
Most of the volcanoes on Earth are in a circle called the ________ of __________.
Ring of Fire.
Most volcanoes are near the ___________ Ocean.
Pacific
Some volcanoes form on _________ and others rise up from the bottom of the ____________.
land; ocean
Do volcanoes erupt thick or thin lava?
Some volcanoes erupt thin lava. Some volcanoes erupt thick lava.
About ______________ of the volcanoes on Earth are active now.
1 500
If you walk on hot lava, it can ___________ your shoes.
melt
What is another word for Earth's surface?
Crust.
True or False: Volcanoes are large mountains that pour out lava.
False: Volcanoes start deep beneath the Earth's surface.
Joanne Green is a _____________, a scientist who studies volcanoes.
Volcanologist.
Earth has ________________ of volcanoes.
thousands