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Most large-scale coal mining in the western United States uses which extraction method? A.surface strip mining B.deep shaft mining C.longwall mining D.drift mining
Weegy: Most large-scale coal mining in the western United States uses which extraction method? A.surface strip mining (More)
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Asked 7/9/2013 6:36:30 AM
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Which type of rock is a source of fossil fuels? A. igneous B. sedimentary C. plutonic D. volcanic
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Updated 268 days ago|5/13/2015 11:38:48 AM
1 Answer/Comment
Sedimentary rock is a source of fossil fuels.
Added 268 days ago|5/13/2015 11:38:47 AM
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Which of these is a metamorphic rock? A. gneiss B. granite C. sandstone
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Updated 1/27/2014 11:47:12 AM
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A. Gneiss is a metamorphic rock.

Added 1/27/2014 11:47:11 AM
This answer has been confirmed as correct, not copied, and helpful.
What may cause igneous or sedimentary rock to be transformed into metamorphic rock? A. the accumulation of deposits through erosion B. the thinning of the crust at a spreading zone C. long periods of intense heat and pressure D. a fracture at a fault or subduction zone
Weegy: Long periods of intense heat and pressure may cause igneous or sedimentary rock to be transformed into metamorphic rock. (More)
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Updated 9/15/2014 4:39:40 PM
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How can a plasmid be described? A. a small organelle B. a small loop of DNA C. a prokaryotic ribosome D. a prokaryotic membrane
Weegy: A plasmid can be described as a small loop of DNA. User: How long ago are prokaryotes believed to have evolved on Earth? A. 3.5 million years B. 1.5 billion years C. 2 billion years D. 3.5 billion years Weegy: Prokaryotes are believed to have evolved on Earth 3.5 billion years ago. User: What instrument was essential to the development of the cell theory? A. the camera B. the test tube C. the x-ray machine D. the light microscope Weegy: It was the camera. (More)
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Updated 9/15/2014 4:38:20 PM
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The light microscope is the instrument which was essential to the development of the cell theory.
Added 9/15/2014 4:38:20 PM
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