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Practice questions for Day 1 of the Mid-Term

 

 

Use the table below to answer questions 1 through 3.

Rock Sample #
Composition
Grain Size
Texture
Rock Name
1
Mostly clay minerals.
???
Clastic.
Shale
2
All mica
Microscopic, fine.
Foliated with mineral alignment
???
3
Mica, quartz, feldspar, amphibole, garnet, pyroxene.
Medium to coarse
Foliated with banding
Gneiss
4
Potassium feldspar, quartz, biotite, plagioclase feldspar, amphibole.
5 mm
???
Granite
  1. State a possible grain size, in centimeters, for most of the particles found in sample 1.  [Any number less than 0.0004 cm (4x10-4 cm) clay sized particles is NOT correct!]
  2. Write the rock name of sample 2.  [Slate]
  3. Write a term or phrase that correctly describes the texture of sample 4.  [Intrusive, Plutonic, nonvesicular, coarse]

Use the image below to answer questions 4 through 6.

  1. Point to where the metamorphic rock Quartzite can be found.  [sandstone and contact metamorphism]
  2. Identify by name the most abundant mineral in rock layer D.  [calcite]
  3. State one piece of evidence shown in the cross section that indicates that rock layer B is older than the igneous intrusion (layer G).  [Contact metamorphism between those layers (B and G).]

Use the image below to answer questions 7 through 9.

  1. State the approximate temperature at point X.  [about 1,000C]
  2. According to the picture, which tectonic plate is labeled Y?  [Juan de Fuca Plate]
  3. Describe the type of tectonic plate motion that formed the oceanic trench.  [convergence, subduction]

Use the following image to answer questions 10 through 12.

  1. What observable characteristics could be used to identify this rock sample as gneiss?  [banding, alternating layers, segregated by mineral type into bands, etc.]
  2. Identify two minerals found in gneiss that contain both iron and magnesium.  [Any two of the following:  biotite mica, pyroxene/augite, amphiboles/horneblende, olivine.]
  3. A dark-red mineral with a glassy luster was also observed in this gneiss sample.  Identify the mineral and state one possible use for this mineral.  [Garnet/almandine jewelry and abrasives]

Use the map below to answer questions 13 through 20.

  1. What is the contour interval for this map?  [20 meters]
  2. What is the elevation of point B?  [40 meters]
  3. Calculate the gradient between points B and C and use the correct units.  [40m/4km = 10m/km]
  4. Draw the profile between points B and C.  [         ]
  5. Which way is Cinder River flowing, and how do you know?  [Northwest, law of Vs - the point of the "V" points to where the water is coming from, or water flows downhill, and you can use the contour lines to find the elevations.]
  6. What sedimentary rock has sediment with the diameter size ranged from 0.1 cm to 0.01 cm?  [sandstone]
  7. Which metamorphic rock is composed of quartz, feldspar, mica, amphibole, and has a banded texture?  [gneiss]
  8. List 4 observable characteristics used to identify granite.  [Any 4 of the following:  Intrusive, Plutonic, grain size of 1mm to 10 mm, coarse texture, nonvesicular, light color, low density, felsic, high in Al, k-spar, quartz, plagioclase, biotite, amphibole]

Use the picture below to answer questions 21 through 27.  This picture shows the parts of the water cycle.  Each arrow and number represent a specific process.

  1. Name the process in the picture where the arrow is labeled with the number 1.  [evaporation  ]
  2. Name the process in the picture where the arrow is labeled with the number 3.  [transpiration ]
  3. Name the process in the picture where the arrow is labeled with the number 4.  [condensation]
  4. Name the process in the picture where the arrow is labeled with the number 5.  [precipitation ]
  5. Name the process in the picture where the arrow is labeled with the number 6.  (Hint:  This is a combination of numbers 1, 2, and 3.)  [evapotranspiration]
  6. Name the process in the picture where the arrow is labeled with the number 7.  [Run off       ]
  7. Name the process in the picture where the arrow is labeled with the number 8.  [infiltration   ]

Use the set of images below to answer questions 28 through 30.

  1. Explain how the difference between type 1 and type 3 stream channels indicate that the average velocities of the streams are different.  [straight path = faster]
  2. Explain why the outside of the curve of a meandering channel experiences more erosion than the inside of the curve.  [water moves faster]
  3. Explain how the cobbles and pebbles that were transported by these streams became smooth and rounded in shape.  [they were polished by abrasion from the sediment within the water.]
  4. Draw on the board what it would look like if samples of rounded quartz grains measuring 2 mm, 3 mm, and 4 mm in diameter were dropped into a large body of water (that is not moving) and allowed to settle.  [The larger particle (4 mm) will be on the bottom, the next size (3 mm) will be above it, and the smallest particle (2 mm) will be on top.]
  5. Draw on the board what it would look like if samples of rounded quartz grains measuring 2 mm, 3 mm, and 4 mm in diameter were dropped into a channel of flowing water and allowed to settle.  [The particles would be deposited in this order:   4 mm (start), 3 mm, 2 mm (end).]