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Vocabulary
Pyroclastic Material
Types of Lava
Explosive or Nonexplosive
Types of volcanoes
100
a vent or fissure in the Earth's surface through which magma and gases are expelled
What is a volcano?
100
large blobs of magma that harden in the air. the shape of this bomb was caused by the magma spinning through the air as it cooled.
What are volcanic bombs?
100
lava that pours out quickly and forms a brittle crust. the crust is torn into jagged pieces as molten lava continues to flow underneath.
What is Aa?
100
Explosive volcano
Which volcano can blast millions of tons of lava and rock from a volcano?
100
this volcano is built of layers of lava released from repeated nonexplosive eruptions. the lava is very runny, so it can spread over a wide area. over time, the layers of lava create a volcano that has gently sloping sides.
What is a shield volcano?
200
the body of molten rock that feeds a volcano
What is a magma chamber?
200
the largest pieces of pyroclastic material, are pieces of solid rock erupted from a volcano.
What is a volcanic block?
200
lava that flows slowly, like wax dripping from a candle. Its glassy surface has rounded wrinkles
What is Pahoehoe?
200
First nonexplosive volcano then explosive volcano
Which is the most common and which is the most rare?
200
these volcanoes are made of pyroclastic material usually produced from moderately explosive eruptions. this pyroclastic material forms steep slopes. cinder cones are small and usually only erupt for a short period of time.
What is a cinder cone volcano?
300
an opening in the earth's surface through which volcanic material passes
What is a vent?
300
pebble-like bits of magma that hardend before they hit the ground.
What is a Lapilli
300
lava that forms when erupts underwater. this lava forms rounded lumps that are shaped of pillows.
What is Pillow lava?
300
The Northwest region of the United States
What region of the US is covered with lava from nonexplosive volcano?
300
these volcanoes are one of the most most common volcanoes. they form from explosive eruptions from pyroclastic material followed by quieter flows of lava. these volcanoes have broad bases and sides that get steeper towards the top.
What is a composite volcano?
400
Magma is composed of molten rock and is stored in the Earth's crust. Lava is magma that reaches the surface of our planet through a volcano vent
What is the difference between lava and magma?
400
forms when the gases in stiff expand rapidly and the walls of the gas bubbles explode into tiny, glasslike slivers. ash makes up most of the pyroclastic material in an eruption.
What is volcanic ash?
400
cool, stiff lava that doesn't travel far from the vent it erupted from. this usually oozes from a volcano and forms jumbled heaps of sharp-edged chunks.
What is blocky lava?
400
A very rare and destructive volcano. In a matter of seconds, it can demolish an entire mountainside.
What is an explosive volcano?
400
a funnel-shaped pit near the top of the central vent of a volcano
What is a crater?
500
the state of being thick, sticky, and semifluid in consistency, due to internal friction
What is viscosity?
500
large amounts of hot ash, dust, are ejected from a volcano. forms when magma explodes from a volcano and solidifies into the air.
What is pyroclastic material and how does it form?
500
Lava that has a ______ viscosity is stiff.
What is a high viscosity?
500
A very common volcano, occurring on both the ocean floor and land. These eruptions produce relatively calm flows of lave. They can release HUGE amounts of lava.
What is a nonexplosive volcano?
500
a wide, flat landform that results from repeated nonexplosive eruptions of lava that spread over a large area
What is a lava plateau?