Transcript Rocks, Rocks, and More Rocks Metamorphic

Rocks, Rocks, and More Rocks
Metamorphic
Classified according to the
arrangement of the grains that make
up the rock & the minerals in them
Metamorphic rocks are nicknamed
“Changing Rocks”.
Why?
How do Metamorphic rocks form?
From heat & pressure deep inside Earth
Metamorphic rocks can form from
Igneous, Sedimentary, or other
Metamorphic rocks as they are pushed
down toward the heat of the mantle.
2 Types of Metamorphic Rock
Foliated
“Banded”
Nonfoliated
“Nonbanded”
Foliated Metamorphic Rock
• Def: Grains arranged in layers or
bands that split into layers
• Examples:
Slate
Schist
Gneiss
Original Rock New Metamorphic Rock
Shale  Slate
Shale (sedimentary) changes to Slate when heated & squeezed by pressure.
Original Rock  New Metamorphic Rock
Granite Gneiss
Granite (Igneous) changes to Gneiss when heated & squeezed by pressure.
Nonfoliated Metamorphic Rock
• Def: Mineral grains arranged
randomly, do not split into layers
• Examples:
Marble
Quartzite
Original Rock  New Metamorphic Rock
Sandstone Quartzite
When Sandstone (Sedimentary) is under extreme heat &
pressure, Quartzite will form.
Uses of Metamorphic Rocks
• Slate:
Old fashioned chalkboards, roofs,
walkways, trim on buildings
• Marble: *Sculptures (most famous –
Lincoln Memorial in Washington
D.C.)
* Buildings
How are the 3 rock types related?
THE ROCK CYCLE!
• Use the online textbook – Active Art – to
complete the rock cycle diagram
• http://www.phschool.com/webcodes10/index.cfm?fuseaction
=home.gotoWebCode&wcprefix=cfp&wcsuffix=1056
• Let’s learn the Rock Cycle Song…
The Rock
Cycle Song
To the tune of Row, Row, Row Your Boat
Sedimentary rock has been formed in layers
Often found near water sources
fossils and decayers
Then there’s Igneous rock, here since Earth was born
Magma, lava cooled and hardened
that’s how it is formed
These two kinds of rocks can also be transformed
With pressure, heat, deep in Earth
Metamorphic they’ll become