ES ch 18 Volcanoes

A _____ is a large intrusive igneous rock body that covers at least 100 square km.

• laccolith

• batholith

• dike

• sill

Rock fragments thrown into the air during a volcanic eruption are called_____.

• tephra

• extrusive

• granite

• lava

what type of texture do most plutons have?

• intermediate grained

• coarse grained

• fine grained

• pegmatic

When magma reaches earth's surface it is called _____.

• intrusive

• a batholith

• rock

• lava

What is the name of a large volcanic crater over 1 km in diameter?

• vent

• a batholith

• a stock

• a caldera

____ is the internal resistance to flow of a liquid.

• viscosity

• weight

• specific gravity

• gravity

_____ is a mixture of volcanic gas, ash and other tephra.

• tephra

• batholith

• pyroclastic flow

• dike

What is the name for an igneous intrusion that is smaller than a batholith but similar in shape?

• dike

• laccolith

• sill

• stock

How is a volcanic crater connected to a magma chamber?

• by a vent

• by a tephra

• by a hot spot

• by a sill

What type of magma has the lowest silica content and is the least explosive?

• granitic magma

• basaltic magma

• rhyolitic magma

• andesitic magma