bell questions 2/3/10 1.igneous rocks are classified by what 3 things? 2.igneous rock that has large...
TRANSCRIPT
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.
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 – 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.
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