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28 Cards in this Set

  • Front
  • Back
prcoess by which rocks on or near the earth's surface break down and change
the removal and transport of weathered material from one place to another
mechanical weathering
the process by which rock s and minerals break down into smaller pieces
frost wedging
the repeated thawing and freezing of water in the cracks of rocks
the process by which outer rock layers are stripped away in succession
chemical weathering
the process by which rocks and minerals undergo changes in their composistion as the result of chemical reactions
the reachtion of water with other substances
the chemical reaction of oxygen with other substances
How does tempature affect mechanical weathering?
temp: frost wedging-freezing and expanding water in the cracks of rocks cause them to break
how does pressure affect mechanical weathering?
a) overlying rock layers are removed, new top layers have less pressure, then cracks from. these cracks are called joints
b)outer rocks are basically stripped away like an onion peel... called expfoiliation
how does water affect chemical weathering
a) dissolves many minderals
b) hydrolosis
how does oxygen affect chemical weathering
how does carbon dioxide affect chemical weathering
a) produce by living organisms through respiration
b) water+carbondioxide= carbonic acid
how does acid precipitation affect chemical weathering
oxidation of sulfur dioxide and nitrogen oxides
what affects the rate of weathering
climate-temp and precimitation

rock type and compsition-sed rocks are easily weathered

surface area- mechanical weathering

when materials are dropped in another location
rill erosion
the erosion by running water in small channels on the side of a slope
gully erosion
when a channel becomes deep and wide, rill erosion can evolve into gully erosion
Zone of Accumulation
the part of a glacier in which there is greater overall gain than loss in volume (top and snowing)
Zone of Ablation
bigger loss in volume (at btoom and metling)
a big hole (glaciers freezes to slide off mountains)
in need of at least 3 cirques to make a horn
ridges between 2 cirques
Kinds of morains
slowest part of a stream
bottom and sides
fastest part of stream
inside of cruves when stream is curvy (meandering stream)
streams form
V-shaped valleys
glaciers form
u-shaped valleys