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| Languages Directory>English>for Specific Purposes>Environmental English Terms,ESL Definitions |
English for Science & Nature Glossary of Terms
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ultraviolet radiation
- Radiation in the
wavelength range between
visible light and
X-rays, divided into
wavelength bands A, B,
C. Much of the
ultraviolet radiations
in bands B and C are
prevented from reaching
the earth's surface by
the ozone layer present
in the atmosphere.
untreated wastewater
- Wastewater discharged
without any wastewater
treatment.
upwelling -
Upward movement of cool
and nutrient-rich
sub-surface waters
towards the surface.
There exist various
types of upwelling. For
fisheries, the most
important type is the
wind-induced coastal
upwelling where the
upward movement is a
consequence of wind
stress (along shore) and
Eckman transport
(offshore).
uranium - a
heavy,
radioactive metal
(atomic number 92) used
in the explosion of
nuclear weapons
(especially one isotope,
U-235).
Urbanisation -
the increase in the
proportion of people
living in towns and
cities. Urbanisation
occurs because people
move from rural areas
(countryside) to urban
areas (towns and
cities). This usually
occurs when a country is
still developing.
urban parks -
parks in cities and
areas of high population
concentration.
urban planning
- the science of
managing and directing
city growth.
utilities -
companies (usually power
distributors) permitted
by a government agency
to provide important
public services (such as
energy or water) to a
region; as utilities are
provided with a local
monopoly, their prices
are regulated by the
permitting government
agency.
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