NEW
Font size
WorksheetsVolcano Summative Test 2
Total questions: 20
Worksheet time: 7mins
If a volcano’s magma is high in silica, how will you describe to its volcanic
activity?
It will erupt quietly
It will remain dormant
It will erupt explosively
It will produce dark-colored lava
Which are needed in the formation of magma?
composition, pressure, temperature
composition, pressure, density
pressure, temperature, distance from the surface
pressure, temperature, volume
Which is TRUE about the composition of magma?
It contains ash, dust, and lava
It contains dissolved gases only.
It contains fragmented rocks only.
It contains both dissolved gases and fragmented materials.
Several kilometers from a volcano, a geologist observes an old lava flow
made up of dark- colored basalt rock. The geologist infers that the lava
must have had____________.
low viscosity
high viscosity
medium viscosity
high silica content
Which is NOT a common gas in magma?
Methane gas
carbon dioxide
sulfur dioxide
water vapor
Viscosity is a measure of a material’s resistance to flow. Which DOES NOT
affect the viscosity of magma?
location of magma
temperature of the magma
chemical composition of the magma
presence of dissolved gases in the magma
Which type of lava will offer the least resistance to flow?
andesitic
basaltic
Rhyolitic
Basaltic and Rhyoliric
The magma in the chamber of a volcano has a very high amount of silica.
If the volcano would erupt, which might happen?
The lava would flow very slowly
The volcano would erupt violently
The volcano would erupt non-explosively
There would be a build-up of pressure below the crater
What can be inferred about the silica content and temperature of magma
if it has a low viscosity?
a high silica content and high temperature
a high silica content and low temperature
a low silica content and high temperature
a low silica content and low temperature
Which correctly shows the types of magma in an increasing order of silica
and gas content?
Andesitic, Basaltic, Rhyolitic
Andesitic, Rhyolitic, Basaltic
Basaltic, Andesitic, Rhyolitic
Rhyolitic, Andesitic, Basaltic
Which type of magma has the lowest chemical and gas content?
basaltic
andesitic
rhyolitic
none of the above
Water vapor is one of the dissolved gases released by erupting volcano. It
is present in large amounts, and is considered harmless. When will it
become harmful to the living things and environment?
when it is in the lower atmosphere
when it is in the middle atmosphere
when it is in the upper atmosphere
when it combines with other dissolved gases
What provides the force that causes magma to erupt to the surface?
the gravity in the lithosphere
the density of the magma
the silica in the magma
the dissolved gases trapped in the magma
Which statement is INCORRECT?
Volcanoes give information about inner Earth.
Volcanoes can be found on land and ocean floor.
Volcanoes show precursory signs before eruption.
Volcanoes that do not produce lava is not dangerous.
What is the basis of classifying volcanoes as active or inactive?
size of the base
shape of the cone
age of the volcano
records of eruption
What is the term used to represent the opening of the volcano where magma
comes out?
chamber
crater
summit
vent
What do you call that orange-red glowing material outside the volcano?
Magma
lava
water vapor
crater
What type of volcanoes are formed from viscous or sticky lava that does not flow
easily?
cinder cones
composite volcanoes
lava domes
shield volcanoes
Which of the following CORRECTLY describes the main vent of the volcano?
It is the part where magma is stored.
It is the central tube-like structure of the volcano.
It is the smaller outlet through which magma is ejected.
It is the channel through which magma travels to the surface of the
Earth.
Which of the following is TRUE about cinder cone?
It is built from particles and blobs of solidified lava ejected from a single
vent.
Lava coming out from this volcano is not accompanied by pyroclastic
materials.
Lava blown out from this volcano breaks into small fragments solidify and
fell as cinder around the vent.
It is formed from viscous magma being erupted effusively onto the surface
and then piling up around the vent.
