Metamorphic rock and rock cycle

Metamorphic Rock• Every metamorphic rock is a rock that has changed its form • “Metamorphic” means “changed form”... Metamorphic Rock• Heat and pressure deep beneath Earth’s surface

Metamorphic Rock

& The Rock Cycle

Chapter 3 in Prentice Hall

Metamorphic Rock

• Every metamorphic rock

is a rock that has

changed its form

• “Metamorphic” means

“changed form”

Metamorphic Rock

• Heat and pressure deep beneath

Earth’s surface can change any rock

into metamorphic rock.

• Sometimes, forces inside the Earth can

push the rock down toward the heat of the mantle

http://www.phschool.com/atschool/science_activity_library/images/earths_interior.jpg

Metamorphic Rock

Metamorphic Rock video

Metamorphic Rock

• When rock changes into

metamorphic rock, its

appearance, texture, crystal

structure and mineral content change

• Metamorphic rock can form out

of igneous, sedimentary, or

other metamorphic rock.

Metamorphic Rock

• Geologists classify metamorphic rocks

by the arrangement of the grains that make up the rocks.

– If grains are lined up in parallel layers or

bands, they are said to be foliated.

Banded gneiss photo from

http://farm1.static.flickr.com/103/364932072_11c4f52462.jpg?v=0

Banded gneiss

is foliated

Metamorphic Rock

Slate

http://www.inspect-ny.com/roof/slate29.jpg

Schist

http://farm4.static.flickr.com/3140/2688358095_c968a7df0b.jpg?v=0

http://www.daviddarling.info/images/quartzite.jpg

Quartzite

Metamorphic Rock

Sedimentary

The Rock Cycle

• Forces inside Earth and at the

surface produce a rock cycle that builds, destroys, and changes the rocks in the crust

• The rock cycle is a series of

processes on and beneath Earth’s surface that slowly changes rock from one form to another.

Photo of Prentice Hall Science Explorer:

Earth Science Rock Cycle diagram page 95.

• The rock cycle can follow many different

pathways, here is one example:

• The intrusive igneous rock, granite could

have formed under the Earth’s surface, then been pushed up forming a mountain The

process of weathering by wind or water or

other forces, then erosion and deposition

could carry granite particles away and start the formation of sedimentary sandstone

• After piling up many layers, the sandstone

could be pushed deep into the Earth where heat and pressure turn it into the

metamorphic rock, quartzite The quartzite, granite, or sandstone could be forced deeper into the Earth where it melts to move toward the Earth’s surface as magma then possibly lava I hope this slide didn’t give you a headache!!

Rock Cycle Question

• When the Earth first formed and was a

new planet, what type of rock would you think was the first to form?

IGNEOUS

Rock review question

• What is the most common coarse-grained igneous rock? Remember coarse-grained means it has large grains, and large

grains are formed when igneous rock

cools slowly below the Earth’s surface.

• Granite

• What kind of texture will a conglomerate rock have?

• Rounded