Exam 3 Review

Topics: Topographic maps; Weathering; Soil erosion; Mass wasting; Hydrologic cycle, stream erosion, transport, deposition; Floods, stream landforms, drainage basins; Streams and associated landforms lab.

Practice questions: True or false?

_____ (1) A thick cover of vegetation decreases soil erosion.

_____ (2) Streams transport great quantities of sediment and lateral stream migration (erosion of the floodplain) is the primary source of sediment to streams.

_____ (3) Water flows more rapidly near the outside of a meander bend than on the inside of the bend.

_____ (4) Meandering streams carry their sediment primarily as bedload.

_____ (5) Point bars are depositional features found in meandering streams.

_____ (6) Deltas are permanent unchanging geologic features.

_____ (7) As a stream rises to flood stage, neither its discharge nor velocity increase.

Multiple choice.

_____ (8) Ions carried in solution in a stream constitute the:

(a) abrasion load
(b) suspended load
(c) dissolved load
(d) saltation factor

_____ (9) When a stream has a greater supply of sediment than it can carry,

(a) it erodes some of the sediment in the channel
(b) it deposits some of the sediment in its channel
(c) it deposits some of the sediment on its banks
(d) it stops flowing

_____ (10) The portion of a valley covered by water during a flood is called the

(a) natural levee
(b) delta
(c) flood plain
(d) alluvial plain

_____ (11) A stream cross section that is shallow and wide is indicative of:

(a) cohesive banks and primarily suspended load transport
(b) cohesive banks and primarily bedload transport
(c) erodible banks and primarily suspended load transport
(d) erodible banks and primarily bedload transport

_____ (12) A delta would be most likely found:

(a) where a stream enters a quiet body of water
(b) where a stream flows over a waterfall
(c) where a stream flows out of the mountains on onto flatter plains
(d) on the inside of a large meander bend

Calculations

(13) If two streams are 8 kilometers apart in reality, how many centimeters apart would they be on a 1:50,000 map?

(14) Draw examples of contour lines representing: (A) a hill and (B) a depression.