Is it raining rocks?!
Lava that has a smooth billowy surface is called what?
pahoehoe
Lava that has a very rough surface is called what?
A place under ground where magma pools is called what?
magma chamber
True or False Most volcanoes occur on plate boundaries.
True
True and False Pyroclastic flows are not strong enough to tear down trees.
False
Lava is what extrusive or intrusive? (it cools above ground)
extrusive
What is a volcanic crater that is formed by the collapse of surface rock into an empty magma chamber?
caldera
Plutons are intrusive or extrusive? (cool in the ground/rocks)
intrusive
A spot on the earth's surface that directly above a column of rising magma. (Hawaiian Islands formed in this way)
hot spot
A place where one tectonic plate is pushed under another tectonic plate.
subduction zone
True or false A tiltmeter is an instrument that uses liquid to register changes in the earth.
True
What kind of plate boundary is along the mid-Atlantic ridge?
divergent plate boundary (moving apart from each other)
Which type of volcano would only have a plug left? dormant, cinder cone, composite volcano or extinct
Extinct
A volcano with a gentle slope and made mostly of lava flows is a what?
cinder cone, caldera, shield volcano, or a pluton
shield volcano
What do volcanologists not monitor?
temperature of volcanoes, number of volcanic bombs, change in gas, or size and shape of volcano/land
number of volcanic bombs
How do volcanic eruptions help scientist study the earth?
gives direct evidence of what is inside the earth
What causes volcanoes or land to bulge?
rising magma or gases
Why are crystals larger in intrusive rock than extrusive rock?
Intrusive rock takes longer to cool than extrusive rock, so the crystals have more time to grow.
Name two benefits of volcanic eruptions?
fertile soil, part of the earth venting system, form new land, building materials, ingredients in hands soaps, diamonds are pushed up to the surface
Name three things volcanologist measure to predict volcanic eruptions.
seismic activity, temperature of surrounding land and water, changes in shape of land, change in the amount/type of gases
Which of the following factors change the magnitude (level of violence) of an eruption? name them
amount of gas, pressure, viscosity of the lava, and/or pyroclastic flow
all-amount of gas, pressure, viscosity of the lava, and pyroclastic flow
Name two different types of pyroclastic substances.
pumice, rock fragments, volcanic bombs, volcanic blocks, ash
Volcanoes can grow with intrusive rock or extrusive rock or both?
both
Put these in order from most violent to least violent.
Strombolian, Icelandic, Plinian, Volcanian, Pelean, Hawaiian
Plinian, Pelean, Strombolian, Hawaiian, Icelandic
Name the different types of volcanoes and the eruptions associated with them.
shield volcano = lcelandic and Hawaiian
cinder cone= strombolian
composite= Pelean and Plinian