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adiabat

adiabat   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
A line plotted on a thermodynamic diagram, usually on a *tephigram, showing as a continuous sequence the temperature and pressure states of a parcel of air with changing height. An ... ... More
age–sex pyramid

age–sex pyramid   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
A set of two histograms set back to back on a vertical axis, depicting the numbers of the two sexes by age group. In many less developed countries the pyramid will have a very wide base; ... More
angular momentum

angular momentum   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

The momentum of a body taking a curved path; for a rotating planet, angular momentum is defined as the moment of the linear momentum of a particle about a point, thus:...

Area of Outstanding Natural Beauty

Area of Outstanding Natural Beauty   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
In the UK, an area in which development is very carefully considered, so that the beauty of the landscape is not diminished. The Countryside and Rights of Way Act 2000 empowers local ... More
aridity

aridity   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

Dryness; aridity is the most common criterion for the definition and classification of drylands, occurring when *evapotranspiration exceeds precipitation (...

atmospheric cells

atmospheric cells   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

Air may move, with a circular motion, northwards or southwards in a vertical cell; see Trump et al. (1982) Boundary-Layer Met....

base flow

base flow   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
The usual, reliable, background level of a river, maintained by seepage from groundwater and by *throughflow, which means that the river can maintain the base flow during dry periods. The ... More
beach

beach   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
An accumulation of *sediment deposited by waves and *longshore drift along the coast. The upper limit is roughly the limit of high tides; the lower, of low tides. The beach classifications ... More
beach morphology

beach morphology   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

Beach form. The occurrence of different types of beach morphology can be parameterized by the dimensionless fall velocity Ω, The equation is:...

beta index

beta index   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

A simple measure of connectivity which can be derived from the formulaβ=eυwhere e = number of edges (links), ...

bid-rent theory

bid-rent theory   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
W. Alonso (1964) notes that when a purchaser acquires land, he acquires two goods (land and location) in one transaction, and a single payment is made for the combination. Thus it is ... More
bifurcation ratio

bifurcation ratio   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
In a drainage basin, the ratio of the number of streams of a given order to the number of streams of the next, higher order. ‘In general, small streams are tributaries of the next bigger ... More
biogeomorphology

biogeomorphology   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
Any study uniting biota with geomorphic form and process (Osterkamp and Friedman (1997) Procs USGS Sed. Workshop). Many biogeomorphological studies concentrate on the processes that link ... More
capture

capture   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
When a river is extending its channel upstream by *headward erosion, it may come into contact with the headwaters of a less vigorous river. The headwaters from the minor river may be ... More
cartogram

cartogram   Quick reference

A Dictionary of Human Geography

Reference type:
Subject Reference
Current Version:
2013
Subject:
Social sciences, Human Geography
Length:
68 words
Illustration(s):
1
A type of map in which the size of the areal units is scaled to a thematic variable such as population or economic output. Such a scaling leads to a distortion in the shape and size of ... More
catchment

catchment   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

The area drained by a river. Catchment shape can be expressed by its circularity ratio:Rc=AA...

catena

catena   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

A sequence of soil types arising from the same parent rock, but distinct from each other because of the variations—such as ...

cellular automata

cellular automata   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
An *agent-based model that works on a two-dimensional lattice grid, where the state of any cell is related to that of its neighbours. At its simplest, a grid of elementary cellular ... More
central place

central place   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

A settlement or nodal point which, by its functions, serves an area round about it for goods and services. Central place theory...

choropleth map

choropleth map   Quick reference

A Dictionary of Human Geography

Reference type:
Subject Reference
Current Version:
2013
Subject:
Social sciences, Human Geography
Length:
114 words
Illustration(s):
1
A thematic *map where areas are shaded according to the value of a variable, such as population characteristics or political voting behaviour. The data displayed are aggregated for defined ... More

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