Bell Questions 2/3/10

1. Igneous rocks are classified by what 3 things?

2. Igneous rock that has large crystals is extrusive or intrusive?

3. Name two uses for igneous rocks.

Sedimentary Rocks

From Sediment to Rock

Erosion – Particles carried away from their source by water or wind

Deposition- sediment settles out of the water or wind carrying it

Compaction – Particles squeezed together under great pressure

Cementation – dissolved minerals crystallize and glue the sediment together

Types of Sedimentary Rocks

Type How it forms Example

Types of Sedimentary Rocks

• Type – Clastic Rocks

• Formed when rock particles are squeezed together

• Examples: shale, sandstone, conglomerate

Copyright [2001] by Andrew Alden, geology.about.com, reproduced under educational fair use.

Types of Sedimentary Rocks

• Organic Rocks

• Formed where the remains of plants and animals are deposited in thick layers.

• Examples: Coal and Limestone (animals with calcite shells)

Copyright [2001] by Andrew Alden, geology.about.com, reproduced under educational fair use.

Types of Sedimentary Rocks

• Chemical Rocks

• When minerals that are dissolved in a solution crystallize.

• Examples: Rock salt, limestone Copyright [2001] by Andrew Alden, geology.about.com,

reproduced under educational fair use.

Rocks from Reefs

Coral Reefs

• What? – skeletons of small marine animals related to jellyfish

Coral Reefs

• How do they form? – coral absorb calcium from the water and use it to make calcite. When they die the calcite skeleton remains

Coral Reefs

• How long? – it takes thousands of years to form a reef

• Importance? – evidence of past environments and habitat for many animals

What is Limestone?

• A form of sedimentary rock

• Organic limestone is made of dead animals

Bell Questions 2/21/08

1. What are the four steps in formation of sedimentary rock.

2. What are the three types of sedimentary rock?