Set 8A (Earth Science)

1. A volcano is a __ mountain landform built from solidified magma. 

• erosional

• 1. depositional

1. Volcanoes are made of __ rock (rock having to do with molten earth).

Because volcanoes form on top of the earth’s crust they are a type of ___.

• 
• proscriptive volcanism

• intrusive volcanism

• extrusive volcanism

Processes that form igneous rock (but that stay underneath the earth’s surface are called __ volcanism.

Label the volcano

a

b

c

d

e

f

lava

magma

vent

crater

ash

(side) vent

Match these parts of a volcano

Groups:

(a) lava

,

(b) magma

,

(c) vent

,

(d) crater

• 1. underground molten rock

• 1. molten rock that has erupted. 

• 1. an opening in which lava can escape

• 1. the larger opening/vent

When the crater sinks in (as lava escapes) it leaves behind an area of lower elevation called a __.

1. Magma is separated into THREE main  categories:

Groups:

(a) Rhyolitic

,

(b) Andesitic

,

(c) Basaltic

• 1. 63% silica and liquid at 1200-1300 F

• less than 52% silica and liquid at 1740-2200 F

• 1. 52-63% silica and liquid at 1380-1740 F

categorize the types of lava

Groups:

(a) pahoehoe

,

(b) ‘a’a

,

(c) pillow lava

• erupts underwater often looks like stacks of pillows

• slow moving and cools with a smoothly wrinkled surface

• 1. even slower and forms a splintered, fractured surface

An eruption that contains ​ (a)   , ash, and small particles is called a (b)   . It can travel at (c)   !

• pyroclastic flow
• 90 miles per hour
• pillow lava
• gasses