Turn in . . .

•6-1 R/R

Warm-Up

•List the 3 causes of volcanoes. Be prepared to describe each.

Volcanic Activity

Section 9-2

Anatomy of a Volcano

Magma Chamber

Pipe

Vent

Side Vent

Crater

Lava Flow

Factors affecting eruption

• Why does this soda “erupt”?

• Video #1• Video #2

Dancing Raisins

•Try whole raisins.•Try raisins cut in ½.•Try different beans.•Pour liquid into strainer in rear sink. •Return pan of materials to the front.

Dancing Raisins

Why do the Raisins dance?

Factors affecting eruption

#1. amount of gas dissolved in magma

↑ gas content = ↑ force of eruption

Factors affecting eruption

#2. temperature

↑ temperature = ↑ flow-y

Very hot, liquidy

Cooler, less flow-y

Factors affecting eruption

#3. amount of silica in magma

Silica = thicker lava

Lava with lots of silica. THICK! – the rock builds up

Lava without lots of silica. THIN and runny!

List 3 factors which affect a volcanic eruption.

Which one is hardest for you to remember?

How can you compensate for that?