Questions and Answers
Detrital sedimentary rocks are classified according to clast size whereas chemical sedimentary rocks are classified based on their dominant minerals.
True
Shales are well cemented because of the high number of pore spaces.
False
There are no sediments on the deep sea floor.
False
Volcanic activity in the early history of the Earth is believed to be responsible for much of the CO2 found in the atmosphere.
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Water-dwelling organisms can form chemical sediments.
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Which environment would be likely to produce a black shale?
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Which of the following makes up the sediment that forms an organic sedimentary rock?
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Which of the following methods of transportation will result in the best degree of sorting?
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Which rock type can contain fossils?
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________ are fragments of pre-existing materials that have been broken down through the processes of weathering.
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Study Notes
Classification of Sedimentary Rocks
- Detrital sedimentary rocks are categorized by clast size, while chemical sedimentary rocks are classified based on their dominant minerals.
Properties of Shales
- Shales are not well cemented due to a high number of pore spaces, contrary to some beliefs.
Sediments in the Deep Sea
- There are sediments present on the deep sea floor, refuting the notion that there are none.
Volcanic Activity and the Atmosphere
- Early volcanic activity contributed significantly to the carbon dioxide levels in Earth's atmosphere.
Formation of Chemical Sediments
- Water-dwelling organisms play a crucial role in forming chemical sediments.
Black Shale Formation
- Black shales are typically produced in swamp environments, which provide the conditions for their formation.
Organic Sedimentary Rocks
- Organic sedimentary rocks consist of materials such as shells and plant fibers.
Transportation and Sorting
- Wind-based transportation results in the best degree of sorting of sediment.
Fossils in Rocks
- Sedimentary rocks are the type that can contain fossils, preserving evidence of past life.
Definition of Sediments
- Sediments refer to fragments of pre-existing materials that have undergone weathering processes.
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Description
Test your understanding of sedimentary rocks and their classifications with these flashcards from Chapter 7. Each card presents a statement about detrital and chemical sedimentary rocks, as well as facts about shales and deep-sea sediments. Challenge yourself to discern true from false!
