Chp 10 - Volcanoes

What factors affect the explosivity of a volcano? Check all which apply.

• Viscosity

• Amount of dissolved gas

• How long since the last eruption

• Where it is located

How do you increase the viscosity of magma? Check all which apply.

• More heat

• Less heat

• More silica

• Less silica

• More water vapor

What are the 2 most abundant gases in magma?

• H₂O and CO₂

• H₂O and SO₂

• CO₂ and SO₂

• H₂O and CO

Volcanoes in Hawaii have what kind of eruption?

• Explosive

• Quiet

This kind of lava flows quickly due to its low viscosity.

• Pahoehoe

• aa

• Pillow lava

• Both pahoehoe and aa

This kind of lava has a "ropy" look.

• Pahoehoe

• aa

• Pillow lava

• Both pahoehoe and aa

This kind of lava is slow moving with sharp edges.

• Pahoehoe

• aa

• Pillow lava

• Both pahoehoe and aa

This kind of lava cools off quickly because it hits hits water.

• Pahoehoe

• aa

• Pillow lava

• Both pahoehoe and aa

What gases are found in volcanoes? Check all which apply.

• Nitrogen

• Sulfur

• Carbon dioxide

• Water vapor

• Chlorine

What gases in a volcano makes them smell bad?

• Nitrogen

• Sulfur

• Carbon dioxide

• Water vapor

• Chlorine