7th grade ch. 3 sec. 4 volcanic landforms

Ch. 3 Sec. 4 Volcanic

Landforms

landforms from

lava & ash

shield volcano

cinder cone

volcano

composite volcano

lava plateau caldera

shield volcano

• Quiet eruptions • Gently sloping mountain

Mauna LoaEarth's Largest Volcano

cinder cone volcano• explosive eruptions

• ash, cinders & bombs

• cone-shaped hill

Paricutin in Mexico

composite volcano • tall cone

shaped mount.• quiet eruptions

(lava) alternate w/ explosive eruptions (ash)

lava plateau• layers of thin, runny lava build up high level area

calderacaldera•huge hole left huge hole left by collapse of by collapse of

volcanic mount.volcanic mount.

soils from lava & ash•fertile (rich) soil•plants grow well

Landforms From

magma

Volcanicneck dike sill batholith Dome

mountain

Volcanic neck• When magma hardens in volcano’s pipe

dike•Magma that forces itself across rock layers

sill•magma squeezes between horizontal layers of rock

batholith• large mass of rock forms when magma cools in crust

Dome mountain

• hardened magma

• forms when uplift pushes batholith toward surface

geothermalactivity

hot springs geyser geothermal

energy

hot springs• formed when

groundwater is heated by nearby body of magma or hot rock underground

geyser•Fountain of water & steam that erupts from ground

geothermal energy•water heated by underground source creates steam energy

•What is this volcano made of? How do geologists classify a volcano made of these materials?           •What is the feature labeled A in the diagram? What is the feature labeled B? How do these features form?           •What is the feature labeled C in the diagram? If this feature becomes plugged with hardened magma, what could happen to the volcano? Explain.           •What is the feature labeled D in the diagram? What can you infer about this feature if the volcano becomes dormant?