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hygiene

(Encyclopedia)hygiene, science of preserving and promoting the health of both the individual and the community. It has many aspects: personal hygiene (proper living habits, cleanliness of body and clothing, healthf...

Jamaica Bay

(Encyclopedia)Jamaica Bay, c.20 sq mi (50 sq km), SW Long Island, SE N.Y., separated from the Atlantic Ocean by Rockaway Peninsula; the Rockaway Inlet links it to the sea. The shallow bay has many islands, and its ...

acid rain

(Encyclopedia)acid rain or acid deposition, form of precipitation (rain, snow, sleet, or hail) containing high levels of sulfuric or nitric acids (pH below 5.5–5.6). Produced when sulfur dioxide and various nitro...

Elbasan

(Encyclopedia)Elbasan ĕlbäsäˈnē [key], town, capital of Elbasan dist., central Albania, on the Shkumbin ...

International Maritime Organization

(Encyclopedia)International Maritime Organization (IMO), specialized agency of the United Nations established in 1948, with headquarters in London and 168 member nations and three associate members. IMO is one of t...

liquefied petroleum gas

(Encyclopedia)liquefied petroleum gas or LPG, mixture of gases, chiefly propane and butane, produced commercially from petroleum and stored under pressure to keep it in a liquid state. The boiling point of liquefie...

Chelyabinsk

(Encyclopedia)Chelyabinsk chĭlyäˈbĭnsk [key], city (1989 pop. 1,142,000), capital of Chelyabinsk region, W Siberian Russia, in the southern foothills of the Urals and on the Mias River. It also lies on the Tran...

biosphere

(Encyclopedia)biosphere, irregularly shaped envelope of the earth's air, water, and land encompassing the heights and depths at which living things exist. The biosphere is a closed and self-regulating system (see e...

speleology

(Encyclopedia)speleology spēlēŏlˈəjē [key], systematic exploration of caves, popularly called spelunking. It includes the measuring and mapping of caves and reporting on the flora and fauna found in them. One...

aviation medicine

(Encyclopedia)aviation medicine, scientific study of the biological effects of aviation, especially on human beings. Although aviation medicine is concerned with such problems as the spread of diseases by persons t...