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 TypeHow it formsExample

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?