Igneous Rocks

Violent mudslides caused by volcanic eruption

Hole at the top of a volcano

Large cold pyroclastics

Large open wave caused by volcanic eruptions

Shrinkage forms in basalt

Volcanoe that erupted to envelope Pompeii

Large hot pyroclastic ejections

Myth Accredited to collapse of Santorini

Volcanic Glass

Volcano that results from low silica

All rock formed by cooling magma

Results from lava flowing out from under a cooled solid layer

Hole underground where magma accumulates

Low silica basalt from long crack

Changed by silicon content

Materials thrown into sky by eruption

Large hole caused by collapse of volcano into magma chamber

Passage of magma chamber to vent

Hole through which magma pours out onto surface

Cone composite of medium silica lava

Best example of flood basalt

Long crack vent which results in flood basalts

Eruptions under water

Sand sized pyroclastics

Largest Volcanic eruption

Cause of volcanic eruptions

Fine grain pyroclastics

positive result of volcanic eruptions used by farmers

placement of magma into overlying rocks

precious mineral formed in volcanic pipes

Site in Idaho with good examples of volcanic features

Type of high silica volcanoe

Volcano which collapsed to form a caldera

Collective term for all landforms cooled beneath the surface

Rocks or landforms formed on surface

Poor synonym for extrusive

Pyroclastic cloud with poisonous exoisuve gas