作者：Kim McCarrick 12 年以前
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Young streams
Gradient
V-shaped land
steep at head; flat at mouth
slope of stream
Stream devlopment
Longitudinal Profile-the side view fom head to mouth.
Types depend on shape, speed, volume of water.
stream = any channelized flow of water
Over time, continuos hill erosion leads to the devlopment of a stream
What affects runoff?
Vegetation
Slope of land
The water content of soil
The intensity and duration of rainfall
Fjord
U-shaped valley filled with water
Kettle lakes
ice melt in own hole
Drumlins
Mounds and hills of tills
Erratics
Large rocks; unrelated placement
Till
Pile of debris left behind; unsorted
Fingerlakes
Giant, long, deep, glacial grooves; makes lakes
Medial
In the middle of the glacier
Terminal
Rock and debris at the furthest point the glacier has reached
Dark bands: Rocks
Usualy on the outer edge
Valley or Alpine
small; in between valleys
Continental
Large; spread out like a pancake (flat suface)
Huge rock conveyor belts of ice
Rate of melting = Rate of moving
parallel grooves; scratched and polished
Organic activity
Roots; animals
Exfoliation and unloading
Rock weathers away
Less weight and pressure
Breaks into sheets and slabs
Frost wedging
water gets in
water frezes, expands
Freeze and thaw cycles
Disintegrates; no change in composition
Physical; into smaller peices
Acid reactions
Dissolves
Oxidation
Rust!
