S9 - Volcano Quiz

Once magma reaches the earth's surface it is called _____.

• silica

• rock

• lava
• tephra

Approximately 70% of the world's composite volcanoes are located around the Pacific Ocean in a region called the ____________. 

• Ring of Fire
• Volcano Ring
• Nucleus of Volcanoes
• Center of Fire

What is magma?

• pieces of the Earth's crust

• molten rock inside of a volcano

• molten rock on the Earth's surface

• plates that meet

TRUE or FALSE: A volcano that erupts quietly will produce a lot of cinders, ash, and bombs.

• TRUE

• FALSE

It is an opening where the magma leaves the volcano.

• sill

• vent

• conduit

• crater

Which of the following describes a volcano that may erupt at any time? 

• potentially active volcano

• active volcano

• inactive volcano

• shield volcano

In a volcano, magma collects in a packet called ________.

• magma flow

• magma chamber

• magma pipe

• hotspot

A _____ is a duct connecting the magma chamber and the outside of the volcano.

• vent

• crater

• fissure

• conduit

An opening on the Earth's crust through which hot molten rock flows out from deep inside the Earth.

• volcano

• Fault line

• fold

• crater

Why does the volcanic eruption happen?

• The pressure in magma chamber increases and pushes magma to the surface.

• The tectonic plates slide past each other.

• The underground rock suddenly breaks along a fault.

• (all of these)