A fixed source of abunant rising magma that forms a volcanic center that has persisted for ten of million of years.
100
What kind of magma composition make a volcanoes have steep slopes?
High composition of silica.
100
How can a pyroclastic flow kill people?
Ash can get into your lungs and kill you.
100
Where do large pieces of debris fall during a explosive eruption?
The larger pieces of debris fall closer to the volcano.
100
Why can people stay safe from lava?
Lava move very slow so they can escape.
200
Where are the volcanoes usally located?
Volcanoes are located on the edges of tectonic plate.
200
How do low content of silica in lava effect volcano?
It effects the shape of a volcano.
200
What is lahar?
A wet mixture of water, mud, volcanic rock fragment, with the consistency of wet concrete, that flows down the slopes of a volcano and it's river valleys.
200
How do ash distribute when the volcano erupt?
the eruption sends ash in to the atmosphere.
200
What can happen if volcanic ash lands and homes, factories, and schools?
The roof can collapse.
300
Why are there no volcanoes in Minnesota?
Because Minnesota is not near or on a plate boundary, nor is it a hotspot.
300
What is a composite cone?
A volcano that is constructed of alternating layers of lava and pyroclastic deposits.
300
How fast can basalt flows move on a steep slope and a shallow slope?
Basalt flow move up to 10 km/h on a steep slope and move less than 1 km/h.
300
Name the three tephra sizes.
Volcanic bombs, lapilli, and ash.
300
How do scientist know that a volcano is going to erupt?
The scientist monitor the volcano by using satellite technology and satellite images.
400
What kind of maps do scientist use to locate volcanoes?
The USGSWhat kind of maps do scientist use to locate volcanoes.
400
What kind of rock is formed by molten materials?
Igneous Rock
400
What do most pyroclastic flows consist of two parts?
a basal flow of coarse fragments that moves along the ground, and a turbulent cloud of ash that rises above the basal flow. Ash may fall from this cloud over a wide area downwind from the pyroclastic flow
400
How does/can volcanic ash impact the environment around it?
Ash can fall on homes factories and schools and collapse roofs. It can also clog machines such as airplanes, cars, etc.
400
How are satellite images use to predict eruptions?
The infrared satellite images record changes in the surface temperature and gas emissions of a volcano over time.
500
What does the USGS show about the Volcanoes?
The USGS shows the location of the volcano, the times it erupted, the last time it erupted and what plate boundary they are on.
500
What are the important facts in interpreting a topographic map?
Contour lines never cross, Closer the contour lines the steeper the slope, every fifth contour line is darker.
500
In 1963, thousands of people was killed in Bali by a flow, but most of the people was not killed by ash getting in to their lungs. How did the ash flow killed so much people? (On the Ring of Fire Movie Guide)
The ash flow was supper heated.
500
What does VEI stand for and what is the significance of it?
VEI stands for volcanic explostivity index, and it rates volcanoes by casualties, height of explostion and volume.
500
In 1973, lava flow at Heimaey, Iceland was threatened to cut off the harbor. How did the locals control the flow?