Chapter 5 Lesson 2 Volcanic Eruptions

Ms. Schreurs

8th Grade Earth Science

Earth’s Structure

My Planet Diary

Hotheaded!

Page 138

What Happens When a Volcano Erupts?

• Inside a Volcano – Magma Chamber= _____________________

___________________________________ – Pipe= a long tube that extends from Earth’s

crust up through the top of the volcano – _______= where molten rock and gas leave the

volcano – Lava Flow= spread of lava as it pours from the

vent – Crater= ______________________________

____________________________________

A Volcanic Eruption • When a volcano erupts, the force of the

expanding gases pushed magma from the magma chamber through the pipe until it ______________________out of the vent

=

Two Types of Volcanic Eruptions • An eruption can either be quiet or

explosive – Depends on silica content

– Silica= ___________________________ ________________________________ • Quiet= low silica

• Explosive= high silica (thick and sticky, traps gasses)

Volcano Hazards

• _________________= the mixture of hot gasses, ash, cinders, and bombs that flow down the sides of a volcano when it erupts explosively

Stages of Volcanic Activity • ________= a volcano

that is erupting or shows signs that it will erupt in the future

• Dormant= ___________ _________________________________________________________

• Extinct= unlikely to ever erupt again