Chapter 2 Explosive Volcanoes

1
Chapter 2- Explosive Volcanoes

• Lesson 2.1- Predicting an Eruption

2
Graphic Overview
Seismograph
Vibrations
Strong
Weak
Volcano
Earthquake
3
Warning Signs

• Seismograph- detects movement or vibrations
• The stronger the vibration the further up and
  down the lines go

4
Bulging Rocks

• Over the years, magma and gases rose inside of
  Mt. St. Helens and pressure on the crust
  increased
• The magma and gases placed more and more pressure
  on the crust creating a bulge
• Then an earthquake caused rocks atop the mountain
  to slide downhill, pressure was released, and an
  explosion occurred.