Volcanoes...The Basics

Volcanoes are ______ mountain landforms built from solidified magma from deep in the Earth.

• erosional

• depositional

• weathered

• glacial

Volcanoes are made of _____ rock.

• sedimentary

• metamorphic

• igneous

• all types of

Igneous rock forms from...

• sediments compacted together

• heat and pressure deep inside Earth

• soil that hardens over time

• molten Earth material that has cooled and hardened

Which igneous rock would cool slowly and have larger crystals?

• intrusive

• extrusive

• midtrusive

A circular depression caused by volcanic activity is called a (a)   .

The magma from the magma chamber will exit the volcano as lava through the (a)   .

Which of the following gases can be released by volcanoes?

• Water vapor

• Carbon Dioxide

• Sulfur Dioxide

• Hydrogen Sulfide

What's another name for a glowing avalanche?

• Lava flow

• Ash and cinders

• Pyroclastic flow

• Tephra

Which statement is true?

• Tephra causes the most death and destruction in volcanic eruptions.

• Lava causes the most death and destruction in volcanic eruptions.

• Lahars cause the most death and destruction in volcanic eruptions.

Lava with a low viscosity contains a high amount of silica.

• true

• false