GEL Week 7-Inro to Volcanoes, Volcanic Basics (1-2)

What are volcanoes?

Volcanoes are a form of natural disaster

Name some recent volcanic eruptions

Mt. Taal- Phillipines

Calbuco- Chile

Hawaii- 2018

T/F: Volcanoes must be explosive to create problems

False

Volcanoes

an erupting vent through which molten rock surfaces; a mountain built from magmatic eruptions

What characteristic features make up volcanoes?

A magma chamber

Fissures and vents

Craters

Calderas

Distinctive profile

Magma chamber

Must be present for volcanoes to form. usually an open cavity or area of highly fractured rock

Vents

a lava outlet on a volcano; they can form anywhere on the volcano

Summit vent

at the top of a volcano

Flank vent

on the side of a volcano

Craters

a bowl shaped depression on a volcano that forms on any of the vents

How are craters formed?

They form as erupted lava cools around the vent

Caldera

a gigantic volcanic depression; much larger than a crater, though similar

How do calderas form?

The magma chamber empties, and is done erupting. A volcano collapses into it, and is usually very explosive