Rocks, rocks, and more rocks metamorphic

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 t

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 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:

• Marbl

e:

Old fashioned chalkboards, roofs, walkways, trim on

buildings

*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

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• Let’s learn 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

The Rock Cycle

Song