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Geography Final
Final Exam, Physical Geography
Regolith | Surface layer rock, above bedrock |
Mass Wasting | Downhill movement of soil, regolith & bedrock under the influence of gravity |
Soil | Biomass plus eroded rock |
Erosion factors | Exposure, climate, weathering, composition of rock |
Physical weathering | Frost, Salt Crystal growth, Exfoliation, Thermal, Biological |
Frost physical weathering | 9% H2O expansion when frozen, happens in high alt, high lat, deserts |
Salt Crystal Growth, physical weathering | water evaporates from sandstone pores, leaving salt crystals behind, crystals grow and disintegrate rock. Arid and semiarid regions |
Exfoliation, physical weathering | rock is exposed at surface, pressure releases, rock expands |
Chemical Weathering | The decomp or decay of minerals in rocks by chemical reactions with water, oxygen & acids. warm, moist climates. Hydrolysis, oxidation, carbonation. |
Colluvium | Degraded debris collected at base of slope. Dry, gravitational. |
Angle of Repose | slope that allows rock, sand, clay, to stay in place |
Sediment | eroded material |
Creep | extremely slow downhill movement of soil and regolith |
Slide | big piece breaks away at once, steep angle |
Flow | river of debris |
Lahar | destructive mudflow on slopes of volcano |
Karst Landscape | landscape underlain by eroded limestone aka caves/sinkholes. limestone caverns |
Stalactites/Stalagmites | Roof/Floor |
New deserts | growing 20,000 sq acres per year |
Cone of Depression | leads to sinkhole |
Aquiclude | Solid, impermeable area overlaying and or underlying an aquifer |
Drainage basin | watershed |
Brackish | not very salty |
3 gorges dam | 1.3333 miles long, china |
Meander | Curve |
Oxbow lake | isolated meander |
Arcuate delta | older more build |
older rivers | move slowly |
younger rivers | more velocity |
evapotranspiration | evaporation from stomata |
sublimation | evaporation from snow and ice |
alluvium | collected debris (sediment) at bottom of slope brought by water |
gully | occasional river on a flat surface |
Rill/Rivulet | Small stream |
Stream erosion | hydraulic, abrasion, corrosion, potholes |
Stream load | solid matter carried by a stream in dissolved form, in suspension and as bed load |
Basin divide | highest peak |
Aggregation | equal amounts of h2o and sediment |
Nick point migration | corner of waterfall erodes |