Chp 3 Volcanoes Test Review

What happens to the viscosity of magma when it has more silica?

• the magma is stickier

• the magma flows faster

• the magma turns into aa

• the magma is less dense

Pahoehoe and aa are produced during what type of eruption?

• Explosive

• Quiet

What causes liquid magma to rise upward through the crust?

• it has pressure built up

• it is more dense

• it is less dense

Which one is a characteristic of QUIET explosions?

• High in silica content

• Lava is thick and sticky

• Produces pyroclastic flows

• Low in silica content

Which one is NOT a characteristic of QUIET explosions?

• Gases bubble out gently

• Gases build up pressure

• Produces pahoehoe and aa

• Lava flows smoothly

How do you know if magma has MORE silica?

• fast flowing lava

• dark-colored lava

• slow flowing lava

• forms basalt

How do you know if magma has LESS silica?

• fast flowing lava

• light-colored lava

• slow flowing lava

• forms rhyolite

When an explosive eruption hurls ash, cinders, bombs, and gases out a volcano, it creates a _______________.

• Hot spot

• Pyroclastic flow

• Volcanic ash

• Magma chamber

The place inside a volcano where magma collects in a pocket is called the _____________.

• Vent

• Crater

• Lava flow

• Magma chamber

________ is a compound found in magma made of silicon and oxygen.

• Aa

• Silica

• Rhyolite

• Basalt

Tags

NGSS.MS-PS1-1