Notes 6 – Sedimentary Rocks Earth Science Mrs. Gordon Friday, February 19, 2016Friday, February 19, 2016Friday, February 19, 2016Friday, February 19, 2016 Friday, February 19, 2016Friday, February 19, 2016Friday, February 19, 2016Friday, February 19, 2016

1. Sedimentary Rocks A. Rocks formed from particles of other rocks, OR the remains of plants and animals, compacted and cemented together (Lithification).

A. Clastic – rock fragments are squeezed and cemented together. ~ breccia – large grains ~ sandstone – fine grains ~ shale – very fine grains 2. Types

~ How are clastic rocks formed? 1. Weathering and erosion (breaking down and moving) 2. Deposition (laying down) 3. Compaction and cementation (squeezing and gluing)

B. Organic – formed from the remains of plants and animals, compressed over millions of years. ~ coal – swamp plants buried in water and squeezed over million of years. ~ limestone – tiny sea creatures die, shells fall to the ocean floor

C. Chemical – formed by evaporation or precipitation ~ Halite ~ Gypsum

3. Uses Sandstone / limestone = building materials Coal = ENERGY Halite = salt! Importance of Coal Importance of Salt The outside walls are faced with sandstone from Tablerock Quarry east of Boise. Convict labor was used to quarry and deliver the sandstone blocks, some weighing up to ten tons.

The largest gypsum crystals ever discovered, of the variety called selenite, with lengths over 11 meters, have been found in Mexico. Research suggests they achieved their immense size because the solution from which they grew remained within in a very narrow, stable temperature range.