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20/20

Subject: Music

This US group was formed in Los Angeles, California, in 1978 by Steve Allen (guitar, vocals) and Ron Flynt (bass, vocals), two expatriate musicians from Tulsa, Oklahoma. Drummer Mike Gallo ...

G-20

G-20   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

...20 ( Group of Twenty ) A group of twenty of the most important economies on the planet. It includes nineteen independent countries along with the European Union: Argentina, Australia, Brazil, Canada, China, France † , Germany † , India, Indonesia, Italy † , Japan, Mexico, Russia, Saudi Arabia, South Africa, South Korea, Turkey, United Kingdom † , United States, European Union. † = also a member of the...

amateurs in geology

amateurs in geology  

For many people the word ‘geologist’ is apt to conjure up images of whiskery Victorian fossil collectors clad in heavy tweeds . Some of today's professionals working in the Earth ...
polarization of the sky

polarization of the sky  

The polarization of sunlight caused by scattering (more specifically, Rayleigh scattering) by molecules in the atmosphere. This polarization reaches a maximum 90° from the Sun. There are three ...
nanoplankton

nanoplankton  

Marine planktonic organisms 2.0–20 μm in size.
microsparite

microsparite  

Sparry calcite in 5–20 μm range. Compare microspar.
pedogenesis

pedogenesis  

The natural process of soil formation, including a variety of subsidiary processes such as humification, weathering, leaching, and calcification.
conjunct

conjunct  

Applied to the distribution of populations that have overlapping ranges, allowing DNA to be exchanged between them. Compare disjunct.
chrysocolla

chrysocolla  

A hydrated silicate of copper, with the formula CuSiO2.2H2O; sp. gr. 2.0; hardness variable; greenish-blue; variable lustre; normally forms from the weathering of copper-rich mineral deposits, and ...
concentration dynamics

concentration dynamics  

A change in the concentrations of suspended sediment in a river. Concentrations usually rise with increased river velocity.
bustee

bustee  

In India, a shanty town; reading S. Mehta (2005) should be mandatory. N. Islam (1996) estimates that almost 50% of Dhaka's population live in bustees, and a major portion of this population is ...
bank calving

bank calving  

The toppling of slabs of earth from a river bank that occurs when the stream undermines the bank.
baydzharakh

baydzharakh  

A dome-shaped polygon, some 3–4 m high and up to 20 m wide, found in a periglacial landscape, and formed as the ice wedges begin to thaw.
Birrimian orogeny

Birrimian orogeny  

A phase of mountain building, affecting Proterozoic greenstone belts in an area of what is now W. Africa.
calcisiltite

calcisiltite  

A fine-grained limestone consisting of silt-sized (but not clay-sized) carbonate particles (more than 2 but less than 63μm sizes).
Canadian

Canadian  

A series (471.8–488.3 Ma ago) of the Lower Ordovician of N. America, equivalent to the Tremadoc and Arenig.
Capitanian

Capitanian  

A stage (260.4–265.8 Ma ago) of the Zechstein Epoch, preceded by the Wordian and followed by the Longtanian.
anchialine

anchialine  

Applied to flooded caves lying deep below the ground surface. They form in limestone environments and from volcanic tubes.
arachnid structure

arachnid structure  

A strange pattern of ridges, gathered in braids and belts, which merge with radial and concentric ridges to give a ‘spiders and cobwebs’ appearance on the surface of Venus, particularly in the area ...
age dependency

age dependency  

The dependency of people too young or too old to be employed full-time on the contributions of those in full employment. ‘The actual dependency burden is determined not just by the sizes of the ...
action space

action space  

The area in which an individual moves and makes decisions about her or his life. ‘The living city is the principal locus of action space and enabler of social change, as well as the source of ...

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