The Rock Cycle

Section 6.1

https://www.youtube.com/watch?v=sN7AficX9e0

Cycles

• A repeating series of events– Duration varies

• S-l-o-w: repeat over a long period of time

– millions of years

•fast: repeat in a short amount of time– hours, days

Types of Cycles

• Water

• Carbon

• Energy

ROCK CYCLE

The Rock Cycle

Definition:

Repeated series of events by which rock gradually and continually changes from one type of rock to another.

Rocks are Recycled in the rock cycle

• Rocks recycle into other rocks!

• During the rocks cycle, rocks are - formed, –broken down, –reformed

There are only THREE basic types of rocks in the rock cycle. igneous, sedimentary, metamorphic

??????

Where does

the rock cycle

begin?

Where does

the rock cycle

end?

The Rock Cycle

• There is no “starting” point

• There is no beginning and no end.

• The cycle can go in any direction.

• It doesn’t have to go “in order”

• It is a very S – L – O - W cycle

• Which type of rock is determined by its ORIGIN.

• How it formed. (remember 3 ways that minerals form?? Pg. 97)

• Magma below the Earth’s surface is the source of all the Earth’s rocks

But… lets start when the earth was molten during the Hadean Era, 3.8 billion years ago

Igneous Rocks (#1-15)

• Magma (molten, liquid rock) rises

• As it nears or reaches the Earth’s surface it cools and crystalizes

• Solidifies into igneous rock

Metamorphic Rock (#16-30)

• Rocks get buried deep beneath layers and are exposed to HEAT and PRESSURE

• They get chemically and physically changed (morphed) into new rocks.

Sedimentary Rocks (#31-45)

• At the surface rocks are broken down into smaller pieces (sediments)

• by weathering and erosion of WATER, wind or ice• Sediments are layered, buried, compacted and

cemented into sedimentary rocks

Bell ringerWhich rock type….(igneous, sedimentary, metamorphic) 1. is formed by heat and pressure on other rocks? 2. is classified by their crystal size being either fine-grained or course-grained? 3. shows “flattened” or “fused” crystals? 4. forms “glassy” rocks that cooled quickly outside the earth’s surface? 5. is formed by mud, sand, rocks, pebbles and shells fragments “cemented” together?