Volcanoes

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Which of the following is a sign of an impending volcanic eruption?

-change in gas emission -ground deformation -earthquakes

_______ magma contains about 70% silica.

Felsic

Which kind of igneous rocks have large grains?

Intrusive

which of the following planets DO NOT have active volcanoes?

Jupiter

Which is the largest volcano on Earth?

Mauna Loa

Which of the following is not a composite volcano?

Mauna Loa

which of the following volcanoes is located in Japan?

Mt. Fuji

Most of the world's active volcanoes are located in the ________ which circles the Pacific Ocean.

Ring of Fire

Which of the following volcanoes erupted in 79 A.D. and buried Pompeii?

Vesuvius

largest pluton, irregular shape

batholith

Small volcanoes on the seafloor are sometimes called

black smokers

When the top of a volcano collapses, it creates a larger depression around the vent called a ________.

caldera

Paricutin in Mexico is a

cinde cone

material is ejected high into the air and falls back around the vent

cinder cone

smallest volcano

cinder cone

steepest slope, concave sides

cinder cone

usually formed by a single eruption

cinder cone

Mount St. Helens is a

composite

Mt. Vesuvius is a...

composite

alternating lava flows and tephra, sometimes explosive sometimes not

composite

can be violently explosive

composite

can produce pyroclastic flows or mudslides

composite

felsic lava, most viscous lava

composite

most dangerous volcanoes

composite

occur at convergent boundaries (Ring of Fire)

composite

Most volcanoes occur at _____ boundaries

convergent

The bowl shaped depression around the volcano's vent is the _____.

crater

pluton that cuts across preexisting rock, often start in a rock crack

dike

Mid-ocean ridges are volcanic landforms that form at ________ plate boundaries

divergent

Which kind of igneous rocks are usually light in color?

felsic

What do tilitmeters measure?

ground deformation

The most explosive volcanoes have magma that has a _____ silica content, a ____ viscosity, and a _____ gas content.

high high high

______ are unusually hot regions of the mantle which melts rock and forces it through the crust to form a volcano.

hot spots

mushrrom-shaped pluton

laccolith

What is a large outpouring of lava from long narrow openings in the crust which builds layers of lava?

lava plateau

Magma rises because it is ______ than the surrounding rock.

less dense.

Felsic magma is ____ explosive than mafic magma.

more

forms when outside of a volcano erodes and solidified pipe is left standing

neck

connects a magma chamber of the vent

pipe

Lava _______ form when lava flows out of fissures (or cracks) in the earth.

plateaus

intrusive igneous rock body

pluton

A ___________ happens when gas, ash, and tephra move down the slop of the volcano.

pyroclastic flow

Hawaiian Islands are

shield

Iceland was formed by

shield

contain a low percentage of gas and silica

shield

largest volcano

shield

mafic lava, least viscous lava

shield

most formed from hotspots in Earth's mantle

shield

non-explosive eruptions

shield

straight gentle slope

shield

The more _____ magma contains, the most viscous it is.

silica

pluton that is parallel to the rocks it intrudes

sill

similar to a batholith, but smaller

stock

The peak (or highest point) of a mountain is also called the ______

summit

______ is dust, ash, rock fragments, volcanic blocks, or volcanic bombs thrown into the air during an eruption

tephra

An opening in the Earth's crust where lava escapes is the _____.

vent

Lava erupts through the opening in the EArth's crust called a ______.

vent

_____ is a liquid's resistance to flow.

viscosity

A _______ is formed when the solidified volcanic pipe remains after most of the outside of the volcano has been eroded away.

volcanic neck

the most abundant gas released during a volcanic eruption is ______. the second is ________.

water vapor carbon dioxide


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