Story In The Rocks!

Andrew Fiora and Sarah Draper

Weathering

• Weathering involves 2 processes,

chemical and physical.

• Chemical Weathering involves

chemical change in some of

minerals within rock.

• Physical weathering physically

breaks up rocks into fragments

without changing chemical

makeup.•A good example of weathering is the Grand Canyon. The Colorado River has been shaping it for thousands of years.

Erosion

• Erosion is when rock particles break off of

one another and move.

•The main agents of erosion are wind,

glaciers, running water and waves.

-Gravity is the force of attraction between

all masses in the universe. Gravity is why

eroded material falls downhill.

•Sheet erosion is erosion by sheets of

running water rather than streams.

Sediments and Deposition

• Sediment is material that settles at the bottom

of a liquid such as an ocean. Deposition is

how these sediments are deposited into the

liquid.

The Rock Cycle

• The rock cycle is a model

that describes how rocks

change formations,

breakdown, and reform.

• Rocks can change from

metamorphic to igneous

to sedimentary.

3 Ways Rocks Can Form

• Molten material called magma cools and

hardens.

• Rock particles are deposited into the water and

cementation occurs.

• Alteration of other rocks through temperature

and pressure induced changes in the minerals.

Igneous Rock

• Igneous rocks are formed either underground

or above ground. Either before or after a

volcano erupts.

• Magma then becomes trapped in small

pockets

• While the magma cools it becomes igneous

rock.

Sedimentary Rock• Sedimentary rocks are formed when

deposited sediment hardens into and usually forms in layers.

• These rocks are also most likely to contain fossils.

Vocabulary:Deposition- how material is deposited into a liquid Sediment-mineral or organic matter deposited by water air or ice

Fossils• Fossils are any remains,

impressions, or any trace of a living thing from a past geologic age.

• Fossils form when organisms that have died and have then become banned into sediment layers. The organism decomposes over time, but the imprint is always there unless weathering and erosion ruin it.

Law of Superposition

• This law states that any undisturbed sequence of rocks deposited in layers, the oldest rock is on the bottom and the newest rock is on the top.

Metamorphic Rock

• Metamorphic rocks form through other types of rocks (sedimentary or igneous) going through extreme heat and pressure.

Geologic Time Scale

• The geologic time scale describes the relationship between events that have occurred during the history of the Earth.

• This time scale shows that the Earth is estimated to be about 4 billion years old.