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Unit 4 Review

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Question
Answer
Where does the formation of coal begin?   show
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Sedimentary rocks are formed when sediments are deposited into layers. What happens next?   show
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Where does the formation of oil and natural gas start?   show
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A delta is formed when sediments are dropped off and builds up at the end of a river. What is the process of dropping off sediments called?   show
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How does a U-shaped valley form?   show
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show A river weathers the rocks and erodes the sediments.  
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show It was once a lake or ocean.  
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show They cannot be replaced in a short amount of time because they take millions of years to form.  
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Fossil fuels form when organic matter is covered with sediments. What else is needed for fossil fuels to form?   show
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show They both need time, layers, and pressure  
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show A river slows down at the mouth of the river and the sediments are deposited.  
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show Erosion  
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show Weathering  
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What is the process called that drops sediments in a new place?   show
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How is a sand dune formed?   show
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show They can be replaced in a short amount of time.  
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show The peaks of an older mountain range would be SMOOTH and ROUNDED.  
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What would the peaks of a younger mountain range look like?   show
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