external processes
Terms
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- Land area that contributes water to a stream.
- drainage basin
- Occurs in the valleys of mountains or hills(treelike).
- dendridic drainage
- All the streams that run off of a mountain.
- radial drainage
- Flat dry rocky land.
- rectangular drainage
-
Large central river reletivly
flat some elevation. - trellis drainage
- The beginning of a river.
- head
- A river that connects with a larger river.
- tributary
- Banks where river overflows.
- flood plain
- The lowest level of a river bed.
- base level
- sea level
- the ultamate base level
- In flood plain very curvy and often moves slow.
- shape of an old river
- In "v" shaped valley or chanel moves fast.
- shape of a new river
- Change in elevation.
- gradient
- Narrow equals more rapids faster.
- channel
-
What is the outside edge of a
mature river on a bend? - cutbank
- When rocks tumble in circles on a river bed or chanel creating small depressions.
- pot holes
- Deposite on the river bed in the center or the side.
- sandbar
- Smothe rock silt and sand
- riverbed
- Layers of rock and soil within the ground.
- horizon
- Organic material once living that acts as a fertalizer.
- humus
- Mostly clay,some minerals and nutrients and some small, broken rock.
- subsoil
- Foundation may have a fracture which can be weathered.
- bedrock
- Broken up bedrock most roots can reach here.
- regolith
- Water traped in soil.
- aquifer
- O, A, E, B, C, R
- soil profile
- What is the inside edge of a mature river on a bend?
- point bar
- Top soil includes finer particles and humus.
- O horizon
- Includes some top soil,roots,seeds.Slightly less fine than topsoil.
- A horizon
- Mixture of soil and small gravel.Alot of silt,clay,and sand.Leaching occurs here.
- E horizon
-
Subsoil,mostly clay,minerals,
nutrients,and small broken rocks. - B horizon
-
Regolith,broken up bedrock,
most roots can reach here. - C horizon
- Foundation unweathered bedrock.
- R horizon