volcano basics
this is melted rock found under earth´s surface
magma
This is the opening where lava comes out of a volcano.
a vent
A volcano that is erupting now or may erupt again is called this.
an active volcano
Volcanic ash helps make soil very good for this activity.
farming
People wear these to protect themselves from volcanic ash.
they are masks
this type of volcano has gentle eruptions and wide slopes
a shield volcano
Magma with high silica is usually this kind of lava.
thick and sticky lava
Ash, lava, and gases are released during this event.
an eruption
Underground volcanic heat can be used to create this kind of energy.
geothermal energy
During an eruption, people should listen to these official messages.
emergency alerts
This volcano type is tall, steep, and often erupts explosively.
a composite volcano
Low-silica magma usually causes this type of eruption.
a gentle eruption
This famous volcano buried Pompeii in 79 A.D.
Mount Vesuvius
Tourists often visit volcanoes to see this hot flowing rock.
lava
Ash can damage this part of your body if protection is not used.
the lungs
Volcanoes usually form where tectonic plates meet or over these hot underground areas.
hot spots
Volcanoes can create this type of new Earth material when lava cools.
new crust
The 1980 eruption of this volcano changed the landscape of Washington State.
Mount St. Helens
People living near volcanoes may need to leave quickly during this emergency action.
evacuation
This emergency bag should contain food, water, and supplies during disasters.
a survival kit
This process happens when one tectonic plate sinks under another and forms volcanoes.
subduction
This volcanic feature forms after the top of a volcano collapses inward.
a caldera
This volcanic explosivity scale measures how powerful eruptions are.
the VEI (Volcanic Explosivity Index)
This dangerous fast-moving mixture of ash, gas, and rock can race down a volcano.
a pyroclastic flow
Lahars are dangerous volcanic disasters made of mud, ash, rocks, and this.
water