What kind of volcano has very runny lava and spreads over a wide area?
100
Craters.
What is the name of a central vent that is found at the top of many volcanoes that is a funnel shaped pit?
100
Yes, Mount Vesuvius was.
Was Mount Vesuvius the cause of the deadly blanket of ash in Pompeii?
100
The Ring of fire is a line of active volcanoes.
What is The Ring of Fire?
200
From boulders the size of houses to tiny grains that will stay in the atmoshpere for many years.
What sizes does pyroclastic material range from?
200
Cinder cone volcanoes.
What kind of volcano is made of pyroclastic material usually produced from moderately explosive eruptions?
200
A calderas.
What is a large, semicircular depression that forms when a chamber that supplies magma is partially empty?
200
Magma forms in the Earth's crust and uppermost layers of the mantle, when their are changes in temperature and pressure the magma underneath get's so hot that the ground soften's and the magma burst's through and boom!
How do volcanoes erupt?
200
Pompeii had ash almost 20 ft thick.
How thick was the ash that covered Pompeii?
300
Pyroclastic flow.
What is one type of particularly dangerous volcanic flow?
300
Composite volcanoes.
What kind of volcano is sometimes called a stratovolcano?
300
Repeated eruptions from volcanoes.
What is a massive outpouring of lava that does not come from individual volcanoes?
300
When there is a decrease in pressure.
What is the most common cause of magma formation?
300
(b) Craters
what kind of volcanic landform has a funnel-shaped pit?(a) Caldera (b) Crater or (c) lava plateau
400
When enormous amounts of hot ash, dust, and gases are ejected from a volcano.
How are pyroclastic flows produced?
400
Japan's Mount Fuji.
What is one composite volcano in Japan?
400
A lava plateau.
What is a wide flat landform that results from repeated nonexplosive eruptions of lava?
400
When temperature increases or pressure on the rock decreases.
When do the rocks under the surface melt?
400
(c) Cinder cone volcano
What kind of volcano is made out of pyroclastic material (a) sheild volcano (b) composite volcano or (c) Cinder cone?
500
700 degrees celsius.
What temperatures can pyroclastic flows exceed?
500
Cinder cone volcanoes.
What kind of volcano often occurs in clusters, commonly on the sides of other volcanoes?
500
Yes, Old Faithful is.
Is Old Faithful a caldera?
500
(a) Fairly constant.
Is the temperature of the mantle (a)fairly constant. (b) very low or (c) very uncontrolled?