NAME: ___________________________
12.001 QUIZ 3
MAY 4, 2007
ANSWER ALL QUESTIONS IN THIS QUIZ BOOKLET AND
HAND IN NOTHING BUT THIS BOOKLET. YOU HAVE
UNTIL 1:55 TO COMPLETE THIS EXAM
Question 1
Question 2
Question 3
Question 4
Question 5
Question 6
Question 7
Question 8
Question 9
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Question 1: Rivers (10 points)
List several factors that influence whether a river will be braided or will form meander
bends.
Question 2: Chemical weathering (10 points)
Rank the following minerals according to weathering stability. Use 5 for the most easily
weathered and 1 for the most resistant to weathering.
Bonus (1 point each) for writing the chemical reaction for any of the minerals.
_____ Halite
_____ Feldspar
_____ Quartz
_____ Clay
_____ Olivine
Question 3: Rivers II (10 points)
Draw a generalized cross section through the situation sketched below.
Above your cross section, label the following: (1) flood plain margins, (2) flood plain, (3),
natural levees, (4) cutbank, and (5) pointbar.
Below your cross section, label each region (1-5) as depositional or erosional.
Question 4: Rivers III (10 points)
Draw a diagram showing an oxbow lake or an abandoned meander develops.
Question 5: Glacial features (20 points)
Describe in a sentence each of the following glacial landforms or deposits.
1. Moraine:
2. Kettle:
3. Loess:
4. Striation:
5. Cirque:
6. Hanging valley:
7. Roches moutonnées:
8. Drumlin:
9: Esker:
10. Firn:
Question 6: Continental growth (20 points)
Draw a cartoon of one way crustal material can be accreted to a continent.
Draw North America and outline and label the following: (1) The Canadian shield, (2)
the interior platform, (3) the Cordillera, and (4) the Appalachian fold belt.
Question 7 (10 points)
How does construction of cities, and in particular concrete walls, on the banks of large
rivers such as the Mississippi increase the dangers and damages of floods downstream?
Mention changes in the hydrograph and the natural role of floodplains.
Question 8: Valley Glaciers (20 points)
Draw both a map and cross sectional view of a valley glacier.
On each view, draw the following:
1.
Flowlines (with arrows indicating flow direction)
2.
Ablation and accumulation zones
3.
Equilibrium line
On the map view, also draw moraines.
Question 9: Short answer (20 points)
Answer each with a phrase or a sentence.
1. How old are the oldest known individual mineral grains?
2. Where do the oldest known individual mineral grains come from?
3. What mineral are the oldest known individual mineral grains?
4. What argument about surface conditions on Earth at that time are these oldest
known individual grains used to make?
5. What aspect of these oldest known mineral grains is measured to make the
argument in question 4?
6. How old is the oldest known whole rock?
7. Where does this oldest known whole rock come from?
8. Why might we have no crustal samples from the time gap you discussed in
question 9?