volcanoes
vocabulary words
types of volcanoes
{ alef question }
100
What is a volcano?
a vent in earth's crust through which melted-or molten-rock flows .
100
What is the Ring of Fire?
The Pacific Ring of Fire is an area of frequent earthquakes and volcanic eruptions encircling the basin of the Pacific Ocean. 
100
what is the types of volcanoes ?
shield volcanoes
composite volcanoes
cinder cone volcanoes
caldera volcanoes 
100
tiny particles of glass and rock are thrown into the atmosphere by a volcano . what is this called ?
this called volcanic ash .
200
How are volcanoes formed?
Volcanoes are formed when magma from within the Earth’s upper mantle works its way to the surface. /GettyImages-608873707-f359835d93ea4f0b95a50cbeeb839c05.jpg)
200
what is a hot spot ?
volcanoes that are not associated with plate boundaries .
200
what does shield volcano look like ?
Large , shield-shaped volcano with gentle slopes made from basaltic lavas . Low viscosity .
200
what type of volcano that formed by alternate layers of ash and lava ?
the answer is : composite volcano
300
Why do volcanoes erupt?
These plates sometimes move. The friction causes earthquakes and volcanic eruptions near the edges of the plates. 
300
what is a lava ?
molten rock that erupts onto earth's surface .
300
what does composite volcano look like ?
Large , steep-sided volcano made from a mixture of andesitic and rhyolitic lava and ash .
300
what made up of dissolved gases , water vapor ,silica (SiO2), and other substance ?
the answer is : magma
400
What is the difference between lava and magma?
Magma is liquid rock inside a volcano. Lava is liquid rock (magma) that flows out of a volcano. Fresh lava glows red hot to white hot as it flows.
400
what is a magma ?
molten rock below the earth surface . 
400
what does the cinder cone look like ?
small , steep-sided volcano; made from moderately explosive eruptions of basaltic lavas .
400
which kind of volcanic flow is also called lahar ?
the answer is : mudflow
500
Why does lava take a long time to cool down?
Lava cools slowly because lava is a poor conductor of heat. Lava flows slow down and thicken as they harden. 
500
what is a volcanic ash ?
Other time , magma might erupt explosively , sending volcanic ash - tiny particles of pulverized volcanic rock and glass - high into the atmosphere .
500
what does caldera volcano look like ?
Large volcanic depression formed when a volcano's summit collapses or is blown away by explosive activity .
500
what is the belt around the pacific ocean called , where many volcanoes occur ?
the answer is : Ring of fire