Download Types of Rock - Teacher Bulletin

Types of Rock
Based on Discover God’s Creation
Chapter 8-4, by Rebecca K. Fraker
Organization
• Rocks can be organized into
three groups:
– Igneous
– Sedimentary
– Metamorphic
Igneous rock
• Characteristics:
– Formed as magma cools
– Intrusive rocks cool slowly below
ground and have a coarse texture.
– Example: granite
– Extrusive rocks cool above
ground. Some are made up of small
crystals (basalt).
– Others lack crystals and have a
smooth texture (obsidian),
– Still others form as gas-filled lava
cools (pumice)
Igneous Rock-uses
• Used in construction
• Used to make monuments
and statues
• Obsidian used by Native
Americans for knives and
arrowheads.
pumice
obsidian
Sedimentary Rock
• Characteristics:
– Most common surface rock.
– Formed from sediments
– Sediments are held together by
minerals that act as cement.
– Often shows layering.
– Examples include
conglomerate, shale,
sandstone, and coquina
limestone.
Sedimentary Rock-uses
• Used in construction
• Used to make monuments
and statues.
• Used for heating and energy.
• Provides important products:
– Coal
– Chalk
– Filters
conglomerate
sandstone
Coquina limestone
Metamorphic Rock
• Characteristics:
– Formed from other rocks that
are changed by heat and
pressure.
– Banding or marbleized
appearance.
– Examples:
• Marble
• Schist
• Slate
Metamorphic Rock-uses
• Used in construction
• Used to make monuments
and statues
marble
Slate
schist