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| Terms for subject Environment (5171 entries) |
| akustisk nivå | acoustic level (Physical quantity of sound measured, usually expressed in decibels) | |
| akvakultur | aquaculture (1. The cultivation and harvest of freshwater or marine animals and plants, in ponds, tanks, cages or on protected beds. This is usually done in inland waters, estuaries or coastal waters. It is estimated that commercial fish farming accounts for more than 10% of the world's fish needs. Fish farming usually concentrates on molluscs, including oysters, mussels and clams, because they are usually immobile and fetch high prices. Shrimps and salmon are also farmed, but the stock have to be caught in the wild first, so that they can be brought up to commercial standards in pens. Aquaculture in not new. In Asia freshwater fish have been farmed for some 4.000 years, usually on small farms. 2. The use of artificial means to increase the production of aquatic organisms in fresh or salt water) | |
| akvatisk dyr | aquatic animal (Animal having a water habitat) | |
| akvatisk mikroorganisme | aquatic micro-organism (Microorganisms having a water habitat) | |
| akvatisk miljø | aquatic environment (Waters, including wetlands, that serve as habitat for interrelated and interacting communities and populations of plants and animals) | |
| akvatisk økologi | aquatic ecology (The study of the relationships among aquatic living organisms and between those organisms and their environment) | |
| akvatisk økosystem | aquatic ecosystem (Any watery environment, from small to large, from pond to ocean, in which plants and animals interact with the chemical and physical features of the environment) | |
| akvatisk organisme | aquatic organism (Organisms which live in water) | |
| akvedukt | aqueduct (A channel for supplying water; often underground, but treated architecturally on high arches when crossing valleys or low ground) | |
| akvifer | aquifer (Layers of rock, sand or gravel that can absorb water and allow it to flow. An aquifer acts as a groundwater reservoir when the underlying rock is impermeable. This may be tapped by wells for domestic, agricultural or industrial use. A serious environmental problem arises when the aquifer is contaminated by the seepage of sewage or toxins from waste dumps. If the groundwater in coastal areas is over-used salt water can seep into the aquifer) | |
| alarm | alarm (Signalling an impending danger in order to call attention to some event or condition) | |
| alder | age (The period of time that a person, animal or plant has lived or is expected to live) | |
| alfastråling | alpha radiation (A stream of alpha particles which are ejected from many radioactive substances having a penetrating power of a few cm in air but can be stopped by a thin piece of paper) | |
| alge | alga (Simple, green, aquatic plants without stems, roots or leaves. They are among the microscopic organisms that form the start of the food chain. Algae are found floating in the sea and fresh water, but they also grow on the surface of damp walls, rocks, the bark of trees and on soil. They contain chlorophyll and other pigments that let them grow by photosynthesis. On land, algae can be useful in improving the fertility of soil by nitrogen fixation) | |
| algemiddel | algicide (Any substance or chemical applied to kill or control algal growth) | |
| algeoppblomstring | algal bloom (Excessive and rapid growth of algae and other aquatic plants when they are stimulated to grow too quickly by pollution. It takes place when there are too many nutrients in the water and is aggravated when accompanied by a rise in temperature. Although the algae grow quickly they soon die because they have swallowed up all the water's nutrients. As they decompose they tend to rise to the surface and form a green slime. Algal bloom have increased because higher levels of nitrogen and phosphates from agricultural areas have leached from the fields into water courses) | |
| alifatisk forbindelse | aliphatic compound (Any organic compound of hydrogen and carbon characterized by a straight chain of the carbon atoms) | |
| alifatisk hydrokarbon | aliphatic hydrocarbon (Hydrocarbons having an open chain of carbon atoms, whether normal or forked, saturated or unsaturated) | |
| alisyklisk forbindelse | alicyclic compound (Any substance composed of two or more unlike atoms held together by chemical bonds characterized by straight-chained, branched or cyclic properties) | |
| alisyklisk hydrokarbon | alicyclic hydrocarbon (A class of organic compounds containing only carbon and hydrogen atoms joined to form one or more rings and having the properties of both aliphatic and cyclic substances) |