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Antarctic Circle
66.5 degrees north
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Arctic Circle
66.5 degrees south
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Conic projection
- globe onto a cone
- parallels are spaced evenly along the central meridian
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Contour interval
vertical distance separating two adjacent contour line
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contour line
line along which all points are of equal elevation above or below a datum (single) plane, usually indicating mean sea level
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Cylindrical projection
- earth onto a cylinder
- navigation uses
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gnomonic projections
great circles appear as straight lines
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Lines of Latitude
(parallels)
Run east-west. Measure distance N-S of equator. North and South Pole Highest points equator is lowest point
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Lines of Longitude
(meridians)
Run north-south. Measure distance E-W of Prime Meridian. Highest (180 degrees)= International Date Line and Prime Meridian (0 degrees) is lowest.
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Planar
(azimuthal)
globe grid onto a plane (used in atlases)
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Tropic of Cancer
23.5 north
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Tropic of Capricorn
23.5 south
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Chemical weathering
breakdown by interaction of water and chemicals present in rock mass
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Continents
Asia, Africa, North America, South America, Antartica, Europe, and Australia/Oceania
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Faulting
break in the earth's crust (tensional or normal fault) by irresistible forces in the crust
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Folding
- intense bending of the earth's crust
- produces accordion effect (anticlines and synclines)
- leads to ridge and valley topography
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Glaciation
movement of continental and alpine ice and snow that rubs and shapes topography
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Geomorphology
study of landform origins, characteristics, and evolutions and their processes
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Gravity transfer
force of gravity is the attraction of the earth's mass for bodies at or near its surface
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Igneous rocks
formed by cooling and hardening of earth material
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Loess
fine fertile soil that is transported by wind (in glaciated regions)
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Pacific Ring of Fire
- series of volcanoes, Pacific ocean, active
- 80% of the world's active
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Pangea
- supercontinent 200 million years ago
- Gondwana and Laurasia->todays continents
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Plate tectonic processes
- portions of earth's mantle and crust on separate plates.
- mountain building, volcanoes, and earthquakes
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Warping
gentle bending of the earth's crust
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weathering
breaking down rock mass into smaller particles
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Delta
triangular soil deposit at teh mouth of a river
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Distributaries
channels carrying water off the main stream of a river
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Mouth
where a river empties into another body of water
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River basin
area drained by a river system
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Tributaries
small bodies of water that feed into the main stream of a river
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Air pressure
weight of air as measured at a point on the earth's surface (barometric pressure)
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Air temperature
- controlled by intensity/duration solar energy.
- decreases with increasing elevation
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atmospheric moisture
precipitation deposited on the earth's surface
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convection
flow of air that replaces warm/rising air and the rapid movement of replacement air
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convectional precipitation
caused by rising/heated/moisture-laden air
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cyclonic (frontal) precipitation
occurs in mid-altitudes as cool and warm air masses meet
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ocean currents
wind direction and differences in H2O density cause water to move in paths from one part of the oncean to another
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Orographic precipitation
occurs as warm air is forced to rise because of some obstruction (hill or mountain)
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Pressure gradients
differences in air pressure between areas that induce air to flow from areas of hight to areas of low pressure
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Wind belts
prevailing surface wind movements responding to pressure gradients (jet stream, monsoon)
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Dry-summer subtropical
(Mediterranean)
Mild rainy winters; hot, dry summers. Warm climate, long growing season. Soil lacks humus. Veg. with large roots (chaparral/maquis) and small leaves. Summer drought.
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Humid continental
middle of large landmasses in midlatitudes; long summer/short summer types; plenty moisture, cold winter, hot summer
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Humid subtropical
soild-leached->acidic, southeast corner of large landmasses in middle latitudes, mild winters, hot, humid summers
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Ice cap
constant cold, less than 10 inches of precip annually
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Steppe
soils are chernozems, live stock grazing, thick black earth rick humus soil
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Demographic Transition Model
traces the changing levels of human fertility and mortality over time. Gives a relationship between pop growth and eco development in stages
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Rate of natural increase
CBR - CDR excluding effects of immigrat/emigr
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