Exam 6: Volcanoes and Igneous Rocks

What is the difference between magma and lava?

The separation of liquids from crystals during crystallization is known as _______.

Crater Lake in Oregon is the remnants of a stratovolcano named Mount Mazama.

Volcanologists can often tell an eruption is eminent because of changes in .

Shield volcanoes can commonly extend more than 10 km in height from their bases.

Igneous rocks with about 60% silica by weight have a(n)_______ composition.

What is the difference between a sill and a dike?

The smallest type of tephra is known as _______.

Satellite images can be used to detect changes in a volcano's surface temperature.

Beneath the surface,rocks completely melt at about 1000ºC.

Discuss how large eruptions like Mt.Pinatubo in 1991 and Tambora in 1815 affected Earth's climate.

Devil's Tower in Wyoming is a good example of a volcanic neck.

Igneous rocks that cool underground from a magma are known as _______.

The volcanic lake in Cameroon that released carbon dioxide and killed 1700 people in 1986 is called _______.

What is the correlation between volcanoes and plate boundaries?

A Strombolian eruption produces cones of loose volcanic rocks known as _______.

Scientists can never predict when a volcano will erupt.

The deaths of the residents of Pompeii and Herculaneum in 79 A.D.is the result of a _______ effect of the volcanic eruption of Mount Vesuvius.

Pyroclastic flows are composed of hot volcanic fragments (tephra)that flow very rapidly,due to the presence of heat and volcanic gases.

Describe why stratovolcanoes are found in the "Ring of Fire."