if th

Large plutons that can cover an area as large as 100 km2 are called

bath something

Magma that is rich in feldspar and silica is called

felsic

An area of volcanic activity far from a tectonic plate boundary is called a(n)

hot spot

which of the following island is cut into two parts by fissues

iceland

Volcanic eruptions may be signaled by

A change in earthquake activity

when oceantic lithosphere subducts beneath oceanic lithosphere

An island arc forms

volcanic dust ash blocks bombs and lapalii are all

pyroclastic matierls

three events thay might signal a volcanic eruption include a changes in earthquake activity the formation of bulges on or near the volcanos and

a change innn gas emitted

the eruption of mount st Helena was

an explosuve eruption

which of the following doe NOT signal a volcanic eruption

an increase in thunderstorms near the colcano

A large depression formed by the collapse of a volcanic cone is called a

caldera

which of the following is not a major volcantic area

central contintental plains

large pyroclastic particals that are then 64 mm

lapiis

Magma that is rich in magnesium and iron is called

mafic

quiet volcantic eruptions commonly result from

mafic magma

which of the following is NOT a major type of volcanic cone?

mantal pluma

the three primartly tetonic se4ttings are zones near convergent and divergent plates,subduction zonrs and

mid ocean riges

which of the following areas in both is a major earthquake zone and a major volcanic zone

pacfic ring of fire

When an underwater volcano erupts, the magma cools quickly, forming

pillow lava

composite volcanos are also known as

stratovolcanos

if the temperature of rock rises above the melting point of the minerials the rock is composed of

the rock will melt

what forms on the ocean floor in a subduction zone?

trench

a charctestic of lava that determines the force of a volcanic eruption is

viscosity

pyroclastic mateiral that is less then 0.25 mm in diameter is called

volcanic dust

any activity that involves the movement of magma on earths surface

volcansism