17.14 Volcanic Eruptions

Which letter on the volcano diagram represents the magma chamber?

• a

• b

• c

• d

• e

An underground pool of magma.

• magma chamber

• pipe

• vent

• lava flow

The process by which igneous rocks are formed...

• heat and pressure deep underneath earth's surface
• melting and cooling of magma
• compaction and cementation of sediments
• recrystallization of minerals within water

If an Igneous rock is dark-colored, which of the following is TRUE?

• high silica content and felsic

• low silica content and mafic (iron and/or magnesium)

• it must be intrusive and fine grained

• it must be extrusive and coarse grained

This rock formed when lava cooled very quickly on Earth's surface. What specific type of rock is it?

• Extrusive Igneous Rock
• Intrusive Igneous Rock
• Non-Foliated Metamorphic Rock
• Biochemical Sedimentary Rock

This rock was formed when magma cooled very slowly inside the Earth. What specific type of rock is it?

• Intrusive Igneous Rock
• Extrusive Igneous Rock
• Foliated Metamorphic Rock
• Clastic Sedimentary Rock

When you watch a volcano erupt molten rock, you are seeing _____

• Lava
• Magma
• Mineral Crystals
• Igneous Rocks

What is the definition of dormant?

• sleeping
• extinct
• active
• invisible

What is the opening that extends from the magma chamber to the top of the volcano called?

• magma
• lava
• vent 
• crater

What is Magma when it reaches the surface of Earth?

• Lava
• Mafic Magma
• Felsic Magma
• None of these