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2013-10-21 14:46:37
Geol exam2 McGraw mult choice

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  1. A sedimentary rock can be:
    • A) only produced by cooling of magma.
    • B) produced from weathered products of pre-existing rocks.
    • C) any hard, solid substance on Earth's surface.
    • D) a naturally occurring, hard, solid substance.
  2. The detrital sedimentary rocks:
    • A) range from conglomerates to shales.
    • B) form at the Earth's surface.
    • C) form from mechanical weathering of other rocks.
    • D) all of these
  3. Where do sediments come from?
    • A) Sediment is formed from magma.
    • B) Rock weathering produces sediment.
    • C) Sediments originally formed as dust fell to Earth from outer space.
    • D) Sediment is formed as rocks are buried and crushed beneath the Earth's surface.
  4. Based on your experience, which of these environments will produce sediments with cross-bedding?
    • A) a stream.
    • B) a nearshore marine environment.
    • C) a desert.
    • D) cross-bedding may develop in all these environments.
  5. Particles of sediment from 4 mm to 2 mm diameter are called:
    • A) clay.
    • B) silt.
    • C) sand.
    • D) gravel.
  6. Rounding is:
    • A) weathering of sharp edges and corners of bedrock exposed at Earth's surface.
    • B) the grinding away of sharp edges and corners of rock fragments during transportation.
    • C) the relative sphericity of a grain.
    • D) all of these
  7. Compaction and cementation are two common processes associated with:
    • A) metamorphism.
    • B) sedimentation.
    • C) transportation.
    • D) lithification.
  8. Which of the following is a chemical sedimentary rock?
    • A) limestone
    • B) rock salt
    • C) rock gypsum
    • D) All of these are chemical sedimentary rocks.
  9. The major difference between sandstone and conglomerate is:
    • A) grain cementation.
    • B) grain composition.
    • C) grain rounding.
    • D) grain size.
  10. Which of the following is a type of sandstone?
    • A) breccia.
    • B) conglomerate.
    • C) arkose.
    • D) All of these are types of sandstone.
  11. Shale differs from siltstone in that:
    • A) there is no difference between shale and siltstone.
    • B) shale has smaller grains than siltstone.
    • C) shale is angular and fissile whereas siltstone is rounded.
    • D) shale has larger grains than siltstone.
  12. The chemical element found in dolomite that is not found in limestone is:
    • A) oxygen.
    • B) magnesium.
    • C) carbon.
    • D) calcium.
  13. A body of sedimentary rock of considerable thickness and with features that distinguish it from adjacent rocks is:
    • A) a depositional environment
    • B) a graded bed.
    • C) a formation.
    • D) a layer.
  14. If sea level rises or the land sinks, what is likely to occur?
    • A) a graded bed will form at the shoreline
    • B) a tidal wave.
    • C) a transgression.
    • D) a regression
  15. The process whereby rocks are changed to sediment is called:
    • A) metamorphism.
    • B) weathering.
    • C) transport.
    • D) abrasion.
  16. A sedimentary rock composed of rounded particles of gravel is called:
    • A) gravelstone.
    • B) sandstone.
    • C) conglomerate.
    • D) breccia.
  17. Sedimentary particles with a size range smaller than 1/256 mm:
    • A) cobbles.
    • B) clay.
    • C) boulders.
    • D) gravel.
  18. A layer in which the grain size becomes smaller vertically within the layer is called:
    • A) is not observed in nature.
    • B) graded bedding.
    • C) cross-bedded.
    • D) foliated.
  19. Cross-bedding observed in sand dunes can be used:
    • A) to determine the height of the sand dune.
    • B) to determine the speed of the wind.
    • C) to determine the direction the wind was blowing.
    • D) all of these
  20. Sedimentary rocks provide clues about:
    • A) depositional environments.
    • B) The plate tectonic setting when the sediment was deposited.
    • C) where the sediments originally came from.
    • D) All of these are correct.