Warm-Up
•List the 3 causes of volcanoes. Be prepared to describe each.
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
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?