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Unit 8.3-Sedimentary Rocks
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24
10
2017
western australian certificate of education
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Zubayr C-137 Rashid
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Unit 8.3-Sedimentary Rocks
Clastic
Clastic Sedimentary Rocks are formed when sediments are laid down by wind and water,gravity & ice, and then compacted and cemented.
They contain broken pieces of rocks. These pieces are known as clasts
They may have layers like stacks of pages in a book because the sediments build up one on top of another as they are deposited.
These may contain rock fossils
Chemical
When minerals dissolved in groundwater crystalline within the sediments or when the water evaporates
Chemical sedimentary rocks are quite soft.
This helps to distinguish them from much harder igneous rocks
Biogenic
Formed when dead plants or matter accumulate
And then cemented together
These sediments are mostly from organisms but they are may be small amounts of sediments from weathered rock
Coal is a type of biogenic rock.
Relative age of Rock Strata
Relative age is not the actual age of the rock but only indictaeds whether a rock is older or younger than another rock.
Be found over a widespread area
Have lived in a narrow period of time in the past
have been abundant with lots of organisms
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