Sedimentary and Metamorphic rocks

 Rocks formed when sediments are cemented or compacted once these sediments are deposited.
 Constitutes about 5% of the Earths crust.
 Many of these rocks also contain fossils.
 Many of these rocks are important economically. (Energy resources)
Classification of sedimentary rocks

 Can be classified as 1) detrital and 2) chemical

 1.Detrital: Rocks formed mostly by mechanical weathering
 Grouped based on particle size:
-Coarse (Ex . Conglomerate, breccia)
-Medium (ex. Sandstone)
-Fine (Ex. Siltstone)
-Very Fine (Ex. Shale

 2. Sedimentary rock that is formed from chemical sediments, which are precipitated from solution.
 Formed from chemical weathering
 EX. Limestone, travertine, coal, coquina, rock gypsum, rock salt.
Metamorphic rocks

 Rocks formed from metamorphism (transformation of one rock to another)
 Metamorphism occurs when preexisting rock is subjected to temperatures and......

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Title: Earth Science- Rocks
Approximate Word Count: 402
Approximate Pages: 2 (250 words per double-spaced page)

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